Padding Oracle Attack or the Virtues of a Glomar response

Rohit Aggarwal wrote “While working on the excellent CryptoPals challenges, I came across the Padding Oracle Attack. The particular version of the attack I was working through, was on CBC mode Decryption when used with AES symmetric key cryptography. The attack has nothing to do with AES and everything to do with this block cipher mode of operation. Various forms of…”