The Crypto Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Number Sequence — Part 10
Solved Level 1 challenge Beaver Code
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge Number Sequence — Part 2
Solved Level 1 challenge Beaver Code
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Original Caesar Cipher
Solved Level 2 challenge Cracking SHA1-Hashed Passwords
Four degrees of difficulty, from pen & paper to complex mathematical problems