Null character in encrypted data

Question

Is it possible that after cbc encryption, null character appears in the resulting multibyte data. If yes, what precaution should I take to avoid it.

Answer 1

Is it possible that after cbc encryption, null character appears in the resulting multibyte data.

Absolutely. It would not be a pseudo-random function if values like 0's were missing.

If yes, what precaution should I take to avoid it.

Treat everything as a byte array with embedded NULLs. Never treat it like a char*.

If you want to treat it like a char*, then you will need to encode it first. Try hexadecimal, Base32 or Base64.