The guys over at NRNU MEPHI have made a set of some challenges that show attacks on real-world crypto. This repository contains solutions to the challenges, as and when I solve them.

All the solutions in this repository have been written in Python 2.7.

For install requirements modules run pip like:

$ sudo pip install -r modules.txt

1. Convert hex to base64
2. Fixed XOR
3. Single-byte XOR cipher
4. Detect single-character XOR
5. Implement repeating-key XOR
6. Break repeating-key XOR
7. AES in ECB mode
8. Detect AES in ECB mode

1. Implement PKCS#7 padding
2. PKCS#7 padding validation
3. Implement CBC mode
4. An ECB/CBC detection oracle
5. Byte-at-a-time ECB decryption (Simple)
6. ECB cut-and-paste
7. Byte-at-a-time ECB decryption (Harder)

1. Implement FCSR generator
2. Frequency Test within a Block

1. Fermat's factorization method
2. Wiener's attack
3. RSA cycle attack
4. RSA simple factorization