This last level of the krypton challenges changed direction with a different type of cipher, a stream cipher. -------------------------------------------------------------------------------- $cat README Hopefully by now its obvious that encryption using repeating keys is a bad idea. Frequency analysis can destroy repeating/fixed key substitution crypto. A ...Read More

The challenge at level krypton5 from the "README" file is much briefer than previously, but is based on the previous level: -------------------------------------------------------------------------------- $cat README Frequency analysis can break a known key length as well. Lets try one last polyalphabetic cipher, but this ...Read More

I recently stumbled upon cyber challenges, and after completing the 33 challenges of the Bandit series in an evening I returned to complete the Leviathan series, then moved on to the cryptographic challenges in the Krypton series. Levels 1 ...Read More