What algorithm can I use for encryption in Java?

Question

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

Answer 1

You could use AES.

Answer 2

Take a look at the Java Cryptography Extension. Here's a simple example.

Answer 3

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

Answer 4

You can use any symmetric key algorithm

Answer 5

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.