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What algorithm can I use for creating an encryption program in Java? What if I want to use the same key for encrypting and decrypting?

Example: I type Hello world and use the key guy, so the words change into xgdsts@dtoll. If I want to decrypt it, I have to use the same key(guy) so it'll become hello world again

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    Just to aid you when googling, what you describe is typically called "symmetric-key encryption". Commented Aug 23, 2010 at 16:44
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    I think it's funny that the question puts a TM on Java, but does not capitalize the name as would be required for the trademark to actually apply. Commented Aug 23, 2010 at 16:47
  • sorry oneal, i'm not aware of that :D Commented Aug 23, 2010 at 17:06

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You could use AES.

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@WenZ, try the link I have posted. It contains a sample.
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You can use any algorithm you want, if you're willing to implement it. If you're asking what algorithms Java provides, the cryptography extension offers (from this list):

  • AES
  • Blowfish
  • DES
  • DESede
  • RC2, RC4, RC5
  • RSA

I believe all those are symmetric (the encryption and decryption key is the same) except for RSA

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That link is to the Java 1.4 documentation. I haven't looked around, but you might want to either annotate that or link to a more recent version of that documentation.
@Thomas I'm having trouble finding the newer documentation, but I added a note in the answer
You might want to check it out to verify, but download.oracle.com/javase/6/docs/technotes/guides/security/… appears to be the Java 6 version of what you linked to.
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Take a look at the Java Cryptography Extension. Here's a simple example.

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I would stick to the industry standards - Triple-DES (3DES) or AES, whereby 3DES is slowly being replaced by AES. Libraries and source code for various languages are available, tested and validated.

I would use random generated keys for data encryption, and distribute these keys using asymetric methods (RSA) based on public/private key pairs.

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You can use any symmetric key algorithm

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