crypto-tools

crypto tools written for practice

padding oracle attack

This is the attack on (PKCS#5 padding)[https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS#5_and_PKCS#7].

Notes on the input/ output format of the padding oracle:

• The padding oracle I used is a 1-block decryption oracle
• Input: "0x... 0x....". The two blocks represent the (iv, ciphertext) tuple.
• Output: "1" for valid padding, "0" for invalid padding.

encryption oracle creator

Uses a decryption oracle to create an encryption oracle.

The message can be multi-block.

Remarks

Development was done in python2, which is going to be deprecated. The algorithm still works, though.