Challenge "Weakened ElsieFour — Part 1" ¶
By: admin on April 28, 2018, 4:29 p.m.
The challenges for the weakened ElsieFour serve as an exercise and use an intentionally weakened version of LC4. ElsieFour combines ideas of modern RC4 stream cipher, historical Playfair cipher and plaintext-dependent keystreams. It can be computed manually. Part 1 is a partly-known key challenge which provides the first 12 characters of the key.