Karfi's Site

You Need a Spyware Remover!

2008-11-24T17:11:00.001-08:00

If you use the internet, “There is over 90% chance your computer is infected with spyware” - Source CNN. Another source may reports more.

Just think about it. You probably have a t least one, if not more computers in your home. Most computers today have internet access. And if you receive email from others and surf to a couple of sites can you be almost completely sure you have some kind of spyware installed in your computer.

How dangerous are spyware?

Let me give you a short list of things spyware can do,

• Spyware can run completely hidden on your computer
• It can slow down your computer a lot
• It can spy on you and send everything you type to someone else
• It can record everything you do, allowing someone to see it later
• It can spy on you and send account information, passwords, credit card numbers and similar to a third party.
• It can “steal” files, pictures, videos and more from your computer

Some spyware will do just a few things and others everything from the list above, and more.

You must keep your computer clean from spyware or risk loosing personal information, financial information or even your private photos or family videos.

Run a spyware scanner regularly to clean out any spyware that may have sneaked their way into your computer. Do note that antivirus software (even the most expensive ones) have problems to keep spyware out. So get a good anti spyware software and use it!

No matter what the spyware's purpose really is, the bottom line is that at the very least it will cause you countless hours of problem solving and slow downs on your computer.

Scan your PC now to make sure it is clean. If you find anything, avoid using any credit cards or visit your bank until the PC is cleaned with a top anti spyware software.

To get more information and a see our Top Three list over spyware removal software with free downloads, please visit our site.

Why Do I Need Anti Virus Software For My Computer?

2008-11-24T16:41:00.000-08:00

If you’ve recently purchased a computer, or are just learning about using email and the internet, you may have heard about computer viruses and anti-virus software. You may be wondering if this is something that you should be concerned about, and if so, what you should do about it. This article will attempt to answer these questions for you. Read carefully or you may don't know when your computer has a strange behaviour.

First, you may be wondering just what a computer virus is. Basically a computer virus is one of many types of small programs that install themselves on your computer without your consent. Usually they enter your program through an email, or while you are browsing a website.

When these programs run, usually without you knowing, they can cause all types of problems with your computer. Some viruses can be mildly annoying, slowing down your computer as they use your computer’s resources for another purpose. Others can be very dangerous, collecting your personal information and sending it to another party, or damaging your hard-drive.

True to their name, viruses are able to use your internet connection and email program and send themselves to the computers of other people you know, spreading themselves just like a contagious disease.

Because of this, just like the health of your body, when it comes to computer viruses, an ounce of prevention is worth a pound of cure. It is much easier to prevent viruses from entering your computer than it is to get rid of them and cure your computer once it becomes infected. This is why Anti-Virus software is important.

Once you realize that you need anti-virus software installed and running on your computer, you’ll have to choose which one to purchase and install. This can be a complicated process, but here are some tips to make it a bit easier.

First, check your computer to see if it came with anti-virus software. Many new computers are shipped with anti-virus programs already to go on them, you just need to turn them on. Check your instruction manual to see if this is the case with your computer.

Check with the vendor. If you purchased your computer from a local retailer, check with them to see what anti-virus program they recommend. They should be more than willing to help you and may even be able to provide you with a discount since you purchased a computer from them.

Once you have your anti-virus installed and running on your computer, be sure to contact the software’s support if you have any questions. It is also important to keep your software updated. Many of these programs will automatically update themselves when you are online. This is very important since new viruses are always appearing and you want to make sure your computer is protected.

Zone Labs vs. Windows XP Service Pack 2 Firewall

2008-11-24T03:04:00.000-08:00

Microsoft Windows XP computer users fall into two categories: first, those who have personal firewall software and second, those who do not. Knowing that the majority of computer users go without a firewall, Microsoft has included an internet security firewall into the latest XP update called Service Pack 2. If you had no prior firewall, the day you download the SP2 update is a happy day for you.

If you already have a personal firewall such as Zone Labs, McAfee or Norton, then a question arises as to which one you keep, because any computer repair store geek would say you should not keep both the XP firewall or your existing software because it has the dynamic Microsoft name behind it, or go with a more niche company for security such as Zone Labs.

What is this Firewall Thing, Anyway?

First, what is a firewall? A personal firewall protects your computer from malicious users by blocking unauthorized access. Who needs a firewall? The term “firewall” gives the impression that only large companies need a “wall” of “fire” to block attacks. You probably feel your computer is too small to attract an attack. But let’s not forget that hackers are hackers because they are students of behavior! They know that millions of people think they’re not targets and forego internet security. They build viruses to seek out such vulnerable computers, which can lead to a multitude of computer problems, not to mention identify theft.

Perhaps if firewalls were renamed, “personal identity insurance,” more people would realize the need to own it! So, does the Windows firewall do the job? While it will block incoming attacks, it will not block programs already installed on your computer from sending information out.

Many downloads you agree to will have spyware attached, and spyware often “phones home” with information about the user. Windows XP firewall will not stop this which is why computer experts suggest that for maximum protection you should go with a full firewall protection like the ones offered by Zone Labs, Norton and McAfee in lieu of XP’s.

Buying a Personal Computer

2008-11-24T03:03:00.000-08:00

For so many people the computer world is a seeming unsolvable jungle filled with mysterious words. In our simply mind, here is a guide to help you understand the personal computer and to give you the information needed to make a shopping decision you can live with so you can enjoy your PC for years to come.

Not long ago the average 'cheaper' personal computer cost was about $1500. - $2000. And this price did not necessarily include the power to edit videos, pictures, or play games. For that you would have had to spend more on upgrades. Now things such as video editing are standard on the newest personal computers. PC’s have become less expensive than ever before and they come with more capabilities than ever.

The personal computer (PC) you purchase will depend upon what it will be used for. So will you surf the Internet and email, working in spreadsheets, playing video games? Who is using the PC and what are there interests? More than likely you will have to accommodate a combination of these or maybe even all of them.

Many personal computers (PC) today offer very similar capabilities so your main decision will be based upon which specialties your personal needs present. For instance if you are mainly interested in gaming than you will be sure to spend more for a good 3D graphics card. If you want to make music you will need a good sound card. If you work all day on your computer or use it for photo editing you will want to invest in a better monitor. Also, make sure your PC has enough memory to quickly work the tasks you have planed.

For the best value for your dollar spend your money on the personal computer components that will best suit your needs.

Top 10 Ways To Protect Yourself From Computer Viruses

2008-11-24T02:59:00.000-08:00

Many people are becoming comfortable using their computers at school, home or in the office it’s only a matter of time before they encounter a computer virus. Here are our top 10 steps to protect you from computer viruses.

Use a high quality anti-virus program. There are many different anti-virus computers programs on the market some of them are better than others. Look to reputable computer magazines or websites for ratings to help you find the one that matches your needs.

Always use your anti-virus software. Make sure your anti-virus software is always turned on and scanning, incoming and outgoing email messages, and any software programs you run.

Keep your antivirus programs up to date. Most programs come with a yearly subscription make sure you take advantage of the updates. More advanced programs allow you to schedule updates or full system scans for “off hours” like 2AM when you aren’t likely to be using your computer.

Keep your computer up to date. From time to time operating systems fall victim to security holes or issue updates. Make sure you check periodically to make sure you are running stable up to date versions of your software.

Backup your data regularly. Most windows computer users keep their documents in the “My documents” folder. This makes it easy to back up all of your important documents. Make weekly or monthly copies to CD or USB drives.

If you use floppy disks or USB drives on public computers like your school computer lab, Kinko’s, or even digital photo printing store make sure you scan them for viruses. Public computers are notorious for not being up to date and properly protected.

Be wary of email attachments. Treat any email attachment as potentially dangerous. Never open attachments from people you weren’t expecting. Also be careful of attachments from people you know but weren’t expecting. Many computer viruses replicate themselves by reading the contacts from an infected computer.

Use text email if possible. While HTML email is prettier and allows you more control over formatting it also can carry computer viruses. If you use text based email the only way to get a virus is by opening an attachment.

Use downloaded freeware and shareware files or software with caution. Try to download them from popular reputable sources that scan the programs before they are uploaded. To make sure you are safe scan the program before you install it on your computer.

Be wary of links in IM or instant messaging software. Don’t accept invitations from people you don’t know and never click a link from someone you don’t trust, they can easily redirect you to another website that will try to install a virus on your computer system.

A Guide To Basic Computer Terminology

2008-11-24T02:58:00.000-08:00

Ram? Mouse? One is an animal and one is a rodent right? Ram...that is the zodiac sign for Aries... If this is what these words mean to you than you can surely use this quick glossary of computer terminology. It would be a good idea to read through them before purchasing a computer because these are things you should know about first. If you already have a computer then these computer terms can help you know what to do if your new computer equipment is unfamiliar. Also, this computer terminology can help you if you have to call in for technical help.

Okay lets go!

Cache: Cache is another type of memory kindred to RAM. The computer uses cache to quickly move data between the RAM and the CPU.

CD-ROM Drive: Most new computers now come with a CD-ROM drive as standard equipment. A CD-ROM drive reads data from a disc. These CDs look like a music CD, but hold data instead of music. CD-ROMs also contain games, dictionaries, recipe files, and lots of other things that you can load onto your computer.

CPU: The CPU, or central processing unit, is the brains of the computer. Most new Windows based programs use a Pentium processor or a AMD Athlon XP. New Macs use a different type of CPU called Power PC.

Disk Drive:Virtually all computers come with a disk drive that can read and save information on portable diskettes, also called floppy disks. You can use floppy disks to save information or to load new software onto your computer.

Hard Drive: The hard drive is also called the hard disk. You'll probably never see it because it is nestled inside your computer. It's the computer's electronic filling cabinet, and it stores the computer's operating system, files, programs and documents.

Keyboard: Just like a typewriter keyboard, this device is the primary way of inputting data into the computer programs.

Megahertz (MHz): This is the clock speed of the microprocessor. The higher the number, the quicker the information is processed. MHz relates to how many millions of instructions can be processed per second.

Memory:This is the circuitry or device that holds information in an electrical or magnetic form. There is read-only memory (ROM), which is information primarily stored on a disk, and random-access memory (RAM), which is chip-based storage inside the computer. Memory is typically measured in megabytes (MBs).

Modem:This mechanism connects a computer to a phone line so information can be sent from one computer to another or the user can access an on-line service or the Internet. In view of the popularity of the Internet, a modem is now considered basic equipment and comes on practically all-new computers. Most modems come with fax capabilities.

Monitor: An output device that allows you to see what you are doing (it is what you are looking into right now to see this). Most computers come with 14 or 15-inch monitors. This size is good for most people's needs. Larger 17 or 21-inch monitors also are available, but may cost more. Myself, I prefer the 17-inch.

Motherboard:The motherboard is the circuit board that everything in the computer plugs into. The CPU, RAM and cache all plug into the motherboard.

Mouse: The mouse is another input device that makes getting around in your computer easier. It is a handheld object that is good for doing tasks such as moving and pointing to objects on the screen, and can replace the function and control keys of the keyboard. (If you need a lesson on how the mouse works and how to use it click here for a tutorial.)

Printer: A printer is an essential part of the computer if you want a hard copy of your work. There are four types of printers on the market: dot matrix, inkjet, bubble jet and laser. The dot matrix is the most basic. Most inkjets and bubble jets can print color and graphics, and a laser printer offers the best resolution at the highest speed.

RAM:Computers save data in two ways: on the hard drive and in random access memory or internal memory. New computer buyers should look for models with at least 16 MBs of RAM (or more, depending on what types of programs you'll be running). Make sure that the computer can be upgraded.

Scanner:A scanner is a useful accessory to have if you are working with lots of artwork or photos. This device can copy written documents, pictures or photographs directly into your computer. There are three types of scanners: handheld, hopper-feed and flatbed.

Sound Card: This device allows your computer to reproduce music, sounds and voices. Make sure you have a sound card if you're planning to play multimedia games.

Video Card: The video card is the part of the computer that sends the images to the monitor.

Well there you have it, a quick course on computer terms. I hope it has helped to guide you in your purchase of a new computer; or to help you with the one you have.

What is a refurbished computer?

2008-11-24T02:56:00.000-08:00

Why people buy a new computer equipment when you can get the same refurbished computer at up to 80% savings and there is no difference in the quality or warranty? Statistics show that people who have already bought a factory refurbished computer will never buy 'new' computer again! Manufacturers are so sure about there refurbished computer equipment that they offer the original warranties.

Exactly what is considered factory refurbished computer equipment?

A lot of things can be labeled factory refurbished. So frivolous are some that it's silly enough to make you laugh! Consumer laws prevent manufacturers from selling anything considered factory refurbished as new, so the second consumer gets the best deal and its just like a new computer!

For example, most major retail stores offer a 30 day money back guarantee on their computer equipment and some consumers take advantage of this. So when the new computer is returned, the manufacturer inspects the product and repackages it like new. But it can't be sold as new now so you get a great price with the original warranty, now its considerd a refurbished computer. Other reasons may be the box was damaged in shipment and so it was returned, a slight defect, the defective part is replaced by the manufacturer, tested and then repackaged just like new. Maybe a minor cosmetic blemish on the casing that was corrected. Demonstration units are also considerd factory refurbished computers. They are also inspected, tested and repackaged. The box was simply opened or brand new items that have been overstocked are also labeled factory refurbished.

Its hard to tell the history of each and every refurbished computer item but what ever the reason for the refurbished label you can be sure that the computer equipment has been inspected and serviced by the manufacturer then tested and repackaged to meet original product specifications, just like a new computer. And like I said before, all computer equipment merchandise is warranted by the original manufacturer unless otherwise specified.

Why buy a refurbished computer?
Well, to save MONEY! Why not get the best value while getting the exact same computer equipment? Also, you get the original manufacturers warranty and get a much, much lower price on your new computer.

Now with refurbished computer equipment you can afford that item which has been just out of your reach because it cost too much. And you will get the same performance! Actually refurbished items have a much lower defect rate than new ones. Only one in ten units that come back for repair is usually a factory refurb! That is because they are closely tested before they are sold. The only difference you may notice is a little label on the outside of the box or simply a brown box. So think hard before your purchase, are you shopping smart?

Computer Hardware Preventive Maintenance Software

2008-11-24T02:42:00.000-08:00

Computers often break down at the worst of all times. These problems can be averted, or at least minimized with preventive maintenance. Some methods of keeping computer hardware in good working order deal with the external components of the computer, such as the keyboard and monitor. For example, it is important to keep the processor away from excess heat and moisture. There are also computer hardware preventive maintenance software programs that can help with the upkeep of other internal aspects of a computer.

While it is rare to find a CMMS that works on all of a computer’s hardware, many different programs can be utilized simultaneously. Some computers have periodic automatic updates available that can be downloaded and used to improve the computer’s performance. Other software programs, known as disk defragmenters, manage hard drive space so that software programs take less time to access. Programs known as hardware diagnostic utilities can check the computer’s hardware components and alert the user about any potential failures. Since some new hardware will not always work on all computers and could cause existing hardware to malfunction, it is important to have a CMMS program to ensure that the new hardware is compatible with existing hardware.

Antivirus programs are another important component of computer hardware preventive maintenance software. Computer viruses have become increasingly common in recent years and can render a good computer useless. While computer viruses mainly attack software programs, they can ruin hardware as well. Several manufacturers make reliable antivirus software. A couple of well-known companies are Norton and McAfee. As with much preventive maintenance software, these programs are usually available for a free trial period before the user must pay a subscription fee.

Computer hardware preventive maintenance software is necessary to keep computers in good working order. This software manages aspects of computer hardware that would be difficult and time-consuming for even the most computer savvy users.

How SMS Works

2008-11-24T02:24:00.000-08:00

SMS, or Short Message Service, is the technology behind what we often refer to as ‘text messages’ or ‘SMSes’, as well as what allows for news alerts on cellular phones. In recent years SMS has become a big industry and is quickly taking the communications world by storm.

Short Message Service actually refers to a framework that uniquely allows computers, or in this case phones, to communicate with each other without the need of a central hub. With SMS, phones can find each other, send short packets of information back and forth, and do it all without any central computer to guide them. But because the system does not rely upon fixed lines like a land based telephone system does, the amount of information that can be sent at one time is limited in size. This depends on the language spoken, but for English letters this typically means around 150 characters (Chinese and Japanese letters are limited to 70).

Quite recently, however, new developments in the technology have allowed for even longer messages to be sent. Long or Concatenated SMS is a development that allows multiple messages to be combined to form a single message. In effect, what happens is that your phone actually sends out a few smaller messages and then the receiving phone simply compiles those messages so that for users on both ends, it appears as though the message were cohesive. While there are some limitations, the brilliance behind SMS is that because there is no need for central hubs, and thus the system can be expanded indefinitely without any concerns of it slowing down or becoming more expensive.

The most common form of SMS is ‘texting’. This usually takes place with a cellular phone in which individuals use the letters behind the number pad on their phone to spell out words and phrases and then send them out. Because many companies charge by the word, individuals have come up with a sort of ‘texting slang’ to cut down on the amount of words required to convey a particular message. For example, ‘gr8’ and ‘BTW’ mean ‘great’ and ‘by the way’. In addition, other words have just been shortened, such as ‘lata’ to mean ‘later’. Most users simply pick up the lingo through frequent use, and although some slang is widely understood and used, other shortcuts are developed within circles of friends and family.

The major advantage of SMS is its price. The price is typically $0.05 per message, a significant cut below that of traditional telephony and cell phone per-minute charges. The savings of SMS has its roots in the nature of the technology. Short Message Service, like SIP, is modeled on a peer to peer model and not a cog and wheel like traditional communication systems. This means that instead of having to route a message through a central hub, your text goes straight from you to its destination. This has radically cut down on the cost of SMS implementation and led to its overwhelming popularity throughout the world.

Short Message Service (SMS) has radically changed the face of the communications industry. While the practice has become quite common throughout the world, it has only recently become popular here in the United Stats, a growth partly predicated upon, surprisingly enough, its featured role in the show American Idol. The fact that ‘texting’ is quickly gaining both in popularity and recognition in the United States is not surprising however, due to its ability to offer users a cheap, quick, and often fun way to communicate with friends and family.

Portable Data Encryptor v 0.1

2008-04-05T21:00:00.000-07:00

I have build a program for encrypting and decrypting your files. I developed it with Java , Eclipse, and I coded it in my DevelopGo , OneBase Linux. Here the capture:

Here the listing program.

// Coded by Karfi 05 April 2008import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import javax.swing.JFormattedTextField;
import java.io.ObjectOutputStream;
import java.security.Key;
import java.security.SecureRandom;import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.WindowConstants;

/**
* This code was generated using CloudGarden's Jigloo
* SWT/Swing GUI Builder, which is free for non-commercial
* use. If Jigloo is being used commercially (ie, by a corporation,
* company or business for any purpose whatever) then you
* should purchase a license for each developer using Jigloo.
* Please visit www.cloudgarden.com for details.
* Use of Jigloo implies acceptance of these licensing terms.
* *************************************
* A COMMERCIAL LICENSE HAS NOT BEEN PURCHASED
* for this machine, so Jigloo or this code cannot be used legally
* for any corporate or commercial purpose.
* *************************************
*/
public class NewJFrame extends javax.swing.JFrame {
private JButton jButton1;
private JButton jButton2;
private JLabel jLabel2;
private JLabel jLabel3;
private JButton jButton3;
private JPasswordField jPasswordField1;
private JLabel jLabel1;
private JTextField jTextField1;

/**
* Auto-generated main method to display this JFrame
*/
public static void main(String[] args) {
NewJFrame inst = new NewJFrame();
inst.setVisible(true);
}

public NewJFrame() {
super();
initGUI();
}

private void initGUI() {
try {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
this.getContentPane().setLayout(null);
this.setTitle("Portable Data Encryptor v0.1");
{
jButton1 = new JButton();
this.getContentPane().add(jButton1);
jButton1.setText("Enc");
jButton1.setBounds(70, 88, 58, 24);
jButton1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out
.println("jButton1.actionPerformed, event="
+ evt);
//TODO add your code for jButton10.actionPerformed
saveFile();

}
});
}
{
jTextField1 = new JTextField();
this.getContentPane().add(jTextField1);
jTextField1.setBounds(71, 17, 141, 19);
}
{
jLabel1 = new JLabel();
this.getContentPane().add(jLabel1);
jLabel1.setText("Input");
jLabel1.setBounds(8, 10, 60, 30);
}
{
jButton2 = new JButton();
this.getContentPane().add(jButton2);
jButton2.setText("Find");
jButton2.setBounds(218, 17, 65, 19);
jButton2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out
.println("jButton2.actionPerformed, event="
+ evt);
//TODO add your code for jButton1.actionPerformed
loadFile();
}
});
}
{
jLabel2 = new JLabel();
this.getContentPane().add(jLabel2);
jLabel2.setText("Password");
jLabel2.setBounds(7, 42, 60, 30);
}
{
jPasswordField1 = new JPasswordField();
this.getContentPane().add(jPasswordField1);
jPasswordField1.setBounds(71, 47, 141, 19);
}
{
jButton3 = new JButton();
this.getContentPane().add(jButton3);
jButton3.setText("Dec");
jButton3.setBounds(150, 89, 62, 24);
jButton3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out
.println("jButton3.actionPerformed, event="
+ evt);
//TODO add your code for jButton10.actionPerformed
saveFile2();

}
});
}
{
jLabel3 = new JLabel();
this.getContentPane().add(jLabel3);
jLabel3.setText("http://karfianto.blogspot.com");
jLabel3.setBounds(68, 112, 148, 30);
jLabel3.setFont(new java.awt.Font("Dialog",0,10));
jLabel3.setForeground(new java.awt.Color(0,0,255));
}

pack();
this.setSize(299, 170);
} catch (Exception e) {
e.printStackTrace();
}
}

private void loadFile ( ) {
JFileChooser chooser = new JFileChooser( );
int result = chooser.showOpenDialog(this);
if (result == JFileChooser.CANCEL_OPTION) return;
try {
jTextField1.setText(chooser.getSelectedFile().getAbsolutePath());
//jTextField3.setText(chooser.getSelectedFile().getName());
}
catch (Exception e) {

}
}

private void saveFile( ) {
File plain = new File(jTextField1.getText());
Key key;
//copy = chooser.getSelectedFile();
File copy = new File(jTextField1.getText()+".pde");
try {
KeyGenerator generator = KeyGenerator.getInstance("DES");
// initialization of keygenerator with PRNG

byte[] seed = jPasswordField1.getText().getBytes();

generator.init(new SecureRandom(seed));
// generating key
key = generator.generateKey();
// creating of file
File kunci =new File(jTextField1.getText()+".key");
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(kunci));
// writing key to a file
out.writeObject(key);
// closing of stream
out.close();

Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
FileInputStream fis = new FileInputStream(plain);
FileOutputStream fos = new FileOutputStream(copy);
CipherOutputStream out2 = new CipherOutputStream(fos, cipher);
byte[] buffer = new byte[1024];
while (fis.read(buffer)>=0) {
out2.write(buffer);
}
kunci.delete();
plain.delete();
JOptionPane.showMessageDialog(this,"File Encrypted.");

}catch(Exception e) {

JOptionPane.showMessageDialog(this, e);
JOptionPane.showMessageDialog(this,"Failed.");
} finally {

}
}

private void saveFile2( ) {

//JFileChooser chooser = new JFileChooser( );
//chooser.showSaveDialog(this);
File plain = new File(jTextField1.getText());
Key key;
//copy = chooser.getSelectedFile();
File copy = new File(jTextField1.getText().replaceAll(".pde",""));

try {
KeyGenerator generator = KeyGenerator.getInstance("DES");
// initialization of keygenerator with PRNG
byte[] seed = jPasswordField1.getText().getBytes();
generator.init(new SecureRandom(seed));
// generating key
key = generator.generateKey();
File kunci =new File(jTextField1.getText().replaceAll(".pde","")+".key");
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(kunci));
// writing key to a file
out.writeObject(key);
// closing of stream
out.close();

Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
FileInputStream fis = new FileInputStream(plain);
FileOutputStream fos = new FileOutputStream(copy);
CipherOutputStream out2 = new CipherOutputStream(fos, cipher);
byte[] buffer = new byte[1024];
while (fis.read(buffer)>=0) {
out2.write(buffer);
}
fos.close();
fis.close();
kunci.delete();
plain.delete();
JOptionPane.showMessageDialog(this,"File decrypted.");
}catch(Exception e) {
JOptionPane.showMessageDialog(this, e);
JOptionPane.showMessageDialog(this,"Failed.");
} finally {

}

}

}

I use the Data Encryption Standard for encryption in this first version of my program.
Ok , I you can try it free, just copy in a file named NewJFrame.java, in eclipse IDE.

Any development of this program , i hope you can report to me via : karfi.anto@yahoo.com

Thanx, Best Regards
Arief Karfianto

Menghilangkan Windows Genuine Alert

2007-12-11T18:42:00.000-08:00

Buka Windows Task Manager.
Hentikan wgatray.exe process pada Task Manager.
Restart Windows XP dan masuk Safe Mode.
Hapus WgaTray.exe dari c:\Windows\System32.
Hapus WgaTray.exe dari c:\Windows\System32\dllcache.
Buka RegEdit.
Browse :
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\Notify
Hapus folder ‘WgaLogon’ dan semua isinya
Restart Windows XP.

~arief karfianto~

Implementasi Fungsi Hash di GNU/Linux (bagian pertama)

2007-12-11T18:24:00.001-08:00

Arief Karfianto

Pernahkah anda memikirkan bagaimana sebuah password disimpan di dalam komputer ? Atau bagaimana menjamin keaslian isi suatu file ? Sebelum menjawab pertanyaan tersebut, terlebih dahulu kita akan berkenalan dengan kriptografi. Kriptografi adalah seni menyembunyikan pesan terang (plaintext) menjadi pesan yang acak (ciphertext). Kriptografi merupakan bagian dari kriptologi. Selain kriptografi, kriptanalisis juga merupakan bagian dari kriptologi. Kriptanalisis merupakan usaha untuk mendapatkan plaintext dari suatu ciphertext tanpa mengetahui kuncinya.

Kriptanalisis juga mengandung usaha untuk menemukan kelemahan dari suatu sistem kriptografi. Jadi perkembangan kriptanalisis juga semakin mendorong perkembangan kriptografi, dan sebaliknya. Cakupan bahasan kriptografi sangat luas sehingga tidak akan kami paparkan dalam tulisan ini. Semoga bisa kami bahas pada kesempatan lain.
Salah satu yang dipelajari dalam kriptografi adalah fungsi hash satu-arah (one-way hash function) – selanjutnya disebut fungsi hash. Fungsi hash merupakan suatu fungsi h yang memetakan input x dengan panjang berapapun pada output h(x) dengan panjang tetap, sifat ini disebut fungsi kompresi. Properti lainnya adalah mudah untuk menghitung nilai h(x) namun sangat sulit untuk mendapatkan input x dengan diketahui nilai h(x), sifat ini disebut property preimage. Fungsi hash inilah yang akan memainkan peranan yang penting dalam penyimpanan password dan integritas data pada suatu sistem operasi, khususnya GNU/Linux.
Password pengguna (users) pada GNU/Linux disimpan dalam file /etc/passwd. Berikut contoh sebagian isi file /etc/passwd pada komputer saya :

[root@localhost ~]# cat /etc/passwd
root:$1$KzJGhs53$UMoqTDH2nmgArMxn60Uc0.:0:0:root:/root:/bin/bash
.
.
intruder:$1$gXo/vhCc$vbOLBQm/OXdbzC0.ztipp1:500:500:intruder:/home/intruder:/bin/bash

Pada contoh diatas terlihat bahwa terdapat user bernama root dan intruder. Password root disimpan dalam file tersebut dalam bentuk $1$KzJGhs53$UMoqTDH2nmgArMxn60Uc0. Bentuk tersebut merupakan keluaran dari fungsi hash yang diterapkan pada password. Hal ini bertujuan untuk menghindari diketahuinya password tersebut oleh orang lain sehingga dapat login sebagai user tertentu.
Proses yang dilakukan saat proses login adalah komputer menerima masukan username dan password dari pengguna. Misalnya username : ‘root’ , password : ‘pass’. Kemudian password tersebut menjadi masukan pada fungsi hash sehingga menjadi bentuk yang acak, misalnya $1$KzJGhs53$UMoqTDH2nmgArMxn60Uc0. Setelah itu, string tersebut dicocokkan dengan string yang ada pada file /etc/passwd untuk username : root. Apabila sama, maka password yang dimasukkan benar untuk username root.
Lalu, bagaimana untuk menjamin keaslian isi suatu file ? Tunggu artikel selanjutnya.

-k4rf1-
PROUDLY PRESENTS FOR
_________ __________________________
___ ____/_____________ _____ __ ____/__ ___/__ ____/
__ /_ __ ___/_ _ \_ _ \_ / _____ \ _ / __
_ __/ _ / / __// __// /___ ____/ / / /_/ /
/_/ /_/ \___/ \___/ \____/ /____/ \____/

F R E E C O M P U T E R S T U D Y G R O U P

Menambah Paket dari Repository pada Fedora

2007-12-11T18:07:00.000-08:00

Menambah Paket dari Repository pada Fedora

Arief Karfianto
karfianto.wordpress.com
karfi.anto[at]gmail.com

Siapa yang belum mengenal Fedora ? Distro Linux yang satu ini memang pantas untuk diperhitungkan pada jajaran distro-distro linux lainnya. Alasannya antara lain karena keandalannya saat digunakan menjadi server. Memang distro ini masih membawa sifat pendahulunya, Red Hat. Pada awal kemunculannya Red Hat sudah menempati kelas tertinggi sebagai distro yang sangat mendukung aplikasi server dan terus dikembangkan. Hingga pada suatu saat pihak Red Hat memutuskan untuk menghentikan dukungannya untuk Komunitas Open Source. Tetapi langkah tersebut diikuti dengan dibentuknya suatu komunitas dibawah bendera Red Hat namun dengan nama project yang berbeda, yaitu Fedora Project. Fedora Project mengembangkan Distro Fedora Core 1 sampai 6 dan sampai saat ini bernama Fedora 7. Paket yang disertakan tidak jauh berbeda dengan distribusi Red Hat .

[root@localhost ~]# mv /etc/yum.repos.d/ /etc/temp-yum.repos.d

Kemudian kita menginstall paket yang bernama createrepo.

[root@localhost ~]# cp /media/FedoraCore-6/Fedora/RPMS/createrepo-0.4.4-2.fc6.noarch.rpm /data/Software/linux/
[root@localhost ~]# mv /etc/temp-yum.repos.d/ /etc/yum.repos.d
[root@localhost ~]# rpm -ivh /data/Software/linux/createrepo-0.4.4-2.fc6.noarch.rpm
warning: /data/Software/linux/createrepo-0.4.4-2.fc6.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 4f2a6fd2
Preparing… ########################################### [100%]
1:createrepo ########################################### [100%]

Lalu kita mulai membuat database repository dari kumpulan software yang sebelumnya sudah dicopy ke harddisk.

[root@localhost ~]# createrepo /data/rpms/
2242/2242 - zsh-html-4.2.6-1.i386.rpm
Saving Primary metadata
Saving file lists metadata
Saving other metadata

Pada tahap ini berdoalah semoga tidak mati lampu dan baterai laptop anda habis  , atau anda akan mengulanginya dari awal. Sekarang anda bisa menuggunya, mungkin sambil mencuci pakaian karena memang prosesnya agak lama.

Pindahkan kembali file kita backup di awal.

[root@localhost ~]# mv /etc/yum.repos.d/ /etc/temp-yum.repos.d
You have mail in /var/spool/mail/root

Sampai pada langkah ini, kita sudah memiliki database repo yang dapat kita gunakan sewaktu-waktu saat ingin menambah paket untuk Fedora kita.

Kali ini saya akan mencontohkan menambahkan paket GNU C Compiler (GCC) untuk kebutuhan programming dengan bahasa C. Caranya sebagai berikut :
[root@localhost ~]# yum install gcc gcc-c++ gcc-objc gcc-objc++ cpp pkgconfig compat-libstdc++-33
Loading “installonlyn” plugin
Setting up Install Process
Setting up repositories
installer 100% |=========================| 951 B 00:00
Reading repository metadata in from local files
primary.xml.gz 100% |=========================| 656 kB 00:00
################################################## 2242/2242
Parsing package install arguments
Resolving Dependencies
–> Populating transaction set with selected packages. Please wait.
—> Downloading header for gcc to pack into transaction set.
gcc-4.1.1-30.i386.rpm 100% |=========================| 51 kB 00:00
—> Package gcc.i386 0:4.1.1-30 set to be updated
—> Downloading header for gcc-c++ to pack into transaction set.
gcc-c++-4.1.1-30.i386.rpm 100% |=========================| 44 kB 00:00
—> Package gcc-c++.i386 0:4.1.1-30 set to be updated
—> Downloading header for gcc-objc++ to pack into transaction set.
gcc-objc++-4.1.1-30.i386. 100% |=========================| 41 kB 00:00
—> Package gcc-objc++.i386 0:4.1.1-30 set to be updated
—> Downloading header for gcc-objc to pack into transaction set.
gcc-objc-4.1.1-30.i386.rp 100% |=========================| 44 kB 00:00
—> Package gcc-objc.i386 0:4.1.1-30 set to be updated
—> Downloading header for compat-libstdc++-33 to pack into transaction set.
compat-libstdc++-33-3.2.3 100% |=========================| 7.4 kB 00:00
—> Package compat-libstdc++-33.i386 0:3.2.3-61 set to be updated
–> Running transaction check
–> Processing Dependency: libstdc++-devel = 4.1.1-30 for package: gcc-c++
–> Processing Dependency: glibc-devel >= 2.2.90-12 for package: gcc
–> Processing Dependency: libobjc.so.1 for package: gcc-objc
–> Processing Dependency: libobjc = 4.1.1-30 for package: gcc-objc
–> Processing Dependency: libgomp = 4.1.1-30 for package: gcc
–> Processing Dependency: libgomp.so.1 for package: gcc
–> Restarting Dependency Resolution with new changes.
–> Populating transaction set with selected packages. Please wait.
—> Downloading header for libstdc++-devel to pack into transaction set.
libstdc++-devel-4.1.1-30. 100% |=========================| 122 kB 00:00
—> Package libstdc++-devel.i386 0:4.1.1-30 set to be updated
—> Downloading header for libgomp to pack into transaction set.
libgomp-4.1.1-30.i386.rpm 100% |=========================| 42 kB 00:00
—> Package libgomp.i386 0:4.1.1-30 set to be updated
—> Downloading header for libobjc to pack into transaction set.
libobjc-4.1.1-30.i386.rpm 100% |=========================| 41 kB 00:00
—> Package libobjc.i386 0:4.1.1-30 set to be updated
—> Downloading header for glibc-devel to pack into transaction set.
glibc-devel-2.5-3.i386.rp 100% |=========================| 103 kB 00:00
—> Package glibc-devel.i386 0:2.5-3 set to be updated
–> Running transaction check
–> Processing Dependency: glibc-headers = 2.5-3 for package: glibc-devel
–> Processing Dependency: glibc-headers for package: glibc-devel
–> Restarting Dependency Resolution with new changes.
–> Populating transaction set with selected packages. Please wait.
—> Downloading header for glibc-headers to pack into transaction set.
glibc-headers-2.5-3.i386. 100% |=========================| 136 kB 00:00
—> Package glibc-headers.i386 0:2.5-3 set to be updated
–> Running transaction check

Dependencies Resolved

=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
compat-libstdc++-33 i386 3.2.3-61 installer 232 k
gcc i386 4.1.1-30 installer 4.7 M
gcc-c++ i386 4.1.1-30 installer 3.3 M
gcc-objc i386 4.1.1-30 installer 2.5 M
gcc-objc++ i386 4.1.1-30 installer 2.7 M
Installing for dependencies:
glibc-devel i386 2.5-3 installer 2.0 M
glibc-headers i386 2.5-3 installer 602 k
libgomp i386 4.1.1-30 installer 62 k
libobjc i386 4.1.1-30 installer 83 k
libstdc++-devel i386 4.1.1-30 installer 9.5 M

Transaction Summary
=============================================================================
Install 10 Package(s)
Update 0 Package(s)
Remove 0 Package(s)

Total download size: 26 M
Is this ok [y/N]: y
Downloading Packages:
Running Transaction Test
warning: compat-libstdc++-33-3.2.3-61: Header V3 DSA signature: NOKEY, key ID 4f2a6fd2
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing: libobjc ####################### [ 1/10]
Installing: libgomp ####################### [ 2/10]
Installing: libstdc++-devel ####################### [ 3/10]
Installing: glibc-headers ####################### [ 4/10]
Installing: glibc-devel ####################### [ 5/10]
Installing: gcc ####################### [ 6/10]
Installing: gcc-objc ####################### [ 7/10]
Installing: gcc-c++ ####################### [ 8/10]
Installing: compat-libstdc++-33 ####################### [ 9/10]
Installing: gcc-objc++ ####################### [10/10]

Installed: compat-libstdc++-33.i386 0:3.2.3-61 gcc.i386 0:4.1.1-30 gcc-c++.i386 0:4.1.1-30 gcc-objc.i386 0:4.1.1-30 gcc-objc++.i386 0:4.1.1-30
Dependency Installed: glibc-devel.i386 0:2.5-3 glibc-headers.i386 0:2.5-3 libgomp.i386 0:4.1.1-30 libobjc.i386 0:4.1.1-30 libstdc++-devel.i386 0:4.1.1-30
Complete!

Akhirnya setelah penantian yang cukup mendebarkan, selesai juga kita menambahkan paket GCC dan sekarang kita bisa segera mulai programming. Yeah.. Linux Programming..!! (mudah-mudahan saya sempat juga untuk membahasnya).
Sementara cukup sekian yang dapat saya sampaikan, mudah-mudahan berguna dan mohon maaf bila ada ‘salah-salah kata’.

Wassalam.

31-10-07

PROUDLY PRESENT FOR
_________ __________________________
___ ____/_____________ _____ __ ____/__ ___/__ ____/
__ /_ __ ___/_ _ \_ _ \_ / _____ \ _ / __
_ __/ _ / / __// __// /___ ____/ / / /_/ /
/_/ /_/ \___/ \___/ \____/ /____/ \____/

F R E E C O M P U T E R S T U D Y G R O U P