Level II Challenges (137)
Page 1 of the challenges in
Level II, ordered by date posted (the most recent appear first).
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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 2 is a partly-known key challenge which provides 12 consecutive characters of the key. Read more...
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Author:
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Published on: 2018-04-28 16:36 |
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Maximum number of attempts for this challenge: 15 |
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