- 1: Convert hex to base64
- 2: Fixed XOR
- 3: Single-byte XOR cypher
- 4: Detect single-charachter XOR
- 5: Implement repeating-key XOR
- 6: Breaking repeating-key XOR
- 7: AES in ECB mode
- 8: Detect AES in ECB mode
- add hex encode util
- add base64 util
- read about modulo math: https://en.wikipedia.org/wiki/Modular_arithmetic https://www.youtube.com/watch?v=g7L_r6zw4-c