Loss of data due to encryption Could any kind of encryption method (AES, etc.) lead to data loss like in lossy compression? I'm interested if data (lossy compressed, lossless compressed, uncompressed) that is encrypted and decrypted will always come back in the same state as before the encryption process, no matter what encryption method is used.

Regards,
Neil
Removing some verbosity:


  I'm interested if data that is encrypted and decrypted will always come back in the same state as before the encryption process.


Yes, it's actually one of the first things you learn in Crypto 101: if $e$ is the encryption function of a cryptosystem and $d$ is its decryption function, then $d(e(m)) = m$ for all valid messages $m$. Any system which does not satisfy this property cannot really be called a cryptosystem.