Question

Can anyone suggest me an algorithm which encrypts data. The encrypted data should not be same as original data but it should have some meaning. For example, if i encrypt “hi” it can display “what”

Answer 1

Encryption and encoding are largely orthogonal. No need to mix them. So I’d:

1. Compress input
2. Encrypt input with standard encryption
3. Write a function that encodes arbitrary binary data as a sequence of words, and hand the ciphertext to it.

The difficulty of step 3 depends on how you interpret “texts that makes sense”. No matter what you do, a human will probably be able to distinguish you text from meaningful text.

In the simplest case, just take a list of say 4096 words and then split the ciphertext into 12 bit blocks, mapping each to a word. For a fancier approach, markov chains are one consideration.