Partial encryption using AES - IOS application

Question

I would like to apply the encryption & decryption technique in one my downloading concept. I want to do the partial encryption using AES 256. Is it possible to do it? is it have any algorithms available for partial encryption&decryption.

Please suggest ideas.

Partial Encryption : it means i dont want to encrypt the full content of the file.It will do the encryption for some specified part of file.(like 10% or 20%) or some junks of file content. basically , I dont want to do the encryption to the entire content THanks.

Answer 1

I'm not aware of any algorithms that offer "partial encryption" functionality. Instead, I think you'll need to take charge of separating out the bytes you wish to encrypt and pass that through standard AES encryption code.