The Cipher Challenge Contest
Four degrees of difficulty, from pen & paper to complex mathematical problems
Solved Level 1 challenge Original Caesar Cipher
Solved Level 1 challenge Number Sequence — Part 2
Solved Level 1 challenge Number Sequence
Solved Level 1 challenge Wheatstone Cryptograph — Part 1
Solved Level 1 challenge Number Sequence
Solved Level 2 challenge AES key — encoded in the machine readable zone of a European ePassport
Solved Level 2 challenge AES key — encoded in the machine readable zone of a European ePassport
Solved Level 2 challenge The T52 Sturgeon Challenge — Part 5
Four degrees of difficulty, from pen & paper to complex mathematical problems