Challenge "ElsieFour — Part 1"  

  By: admin on Oct. 3, 2017, 6:37 a.m.

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.

 Last edited by: admin on Oct. 31, 2021, 2:55 a.m., edited 1 time in total.

Re: Challenge  

  By: AnLeRo on Feb. 8, 2018, 8:18 p.m.

The level of this challenge has been changed to level 3, because it has not been solved yet and because we think it's harder than estimated at the beginning.

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