can any one suggest me about how to start with Steganography and cryptograhpy..
i want to make an project in which an encrypted message is hide in digital file and and for recieve this message i use the public and private keys ......................plz suggest me >>>>>>>>>>
any better ideas are also welcome
Java has all kinds of built in cryptography support. In the recent past, the encryption provided by Sun was limited because of U.S. export restrictions. Look up "BouncyCastle" (yes, I'm serious, their name is a joke, but they have great providers) for strong encryption providers.
As far a stenography, that is something you will have to research and implement on your own.