Crypto Challenges
15 challenges found
Broken Record
A secret was hidden, but the same key was used over and over. Repetition is the enemy of secrecy. Ciphertext (hex):...
Paper Tiger
These numbers look impossibly large, but looks can be deceiving. Not everything needs brute force. Public Key:...
Bad Neighbors
Two separate keys were generated for two separate systems. But corners were cut during key generation, and now they...
Crystal Ball
This system generates random numbers for its encryption keys. But how random is random, really? Watch the output long...
Basic Encoding Soup
Every hacker needs to recognize common encoding schemes. This challenge layers three of the most common encodings...
The ROT Side
ROT13 is childs play. But what about its more obscure cousin that handles the full printable ASCII range? Ciphertext:
Escaped Reality
Web applications love to encode special characters. Sometimes the encoding gets applied in unexpected orders....
Double Trouble
Sometimes attackers apply the same encoding multiple times to evade detection. Simple but effective. Ciphertext:
Compressed Thoughts
Malware authors love compression. The magic bytes 1f 8b are your friend. Ciphertext: