MysteryTwister C3
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Level III Challenges (58)

Page 1 of the challenges in Level III, ordered by date posted (the most recent appear first).

ElsieFour — Part 1

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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-plaintext challenge which provides 2 messages that were encrypted with the same key.
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Published on: 2017-10-03 06:37
Maximum number of attempts for this challenge: 15

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