Challenge "Akelarre Part 1"

Challenge "Akelarre Part 1"  

  By: admin on Nov. 24, 2010, 2:35 p.m.

Akelarre is a combination of IDEA and RC5. However, Akelarre is not as strong as those two ciphers. Perform a known plaintext attack on Akelarre.

 Last edited by: admin on Oct. 31, 2021, 2:54 a.m., edited 1 time in total.

Re: Challenge  

  By: fmoraes on Dec. 5, 2013, 6:53 p.m.

I think I found the shift but I am having trouble validating my program. It solves the case of no shift but that wrinkle is causing me some grief.

Would one of the previous solvers be willing to confirm the shift I found via PM or email?


Re: Challenge  

  By: Veselovský on Dec. 9, 2013, 5:20 p.m.

Hello Francisco,

you can send me your shift in PM and I will try to find the shift in my documents… but I am not making precise documentation of what I did when solving particular challenge, since I am lazy to do that… and after a week or so I have sometimes no idea how I solved some challenge… so I do not guarantee that my check will be 100% correct ;-)

Best regards

Re: Challenge  

  By: Veselovský on Dec. 9, 2013, 5:29 p.m.

…if I recall correctly, there were two likely shifts after the first stage of attack. Only in the final stage it was possible to decide which one of the two was correct.

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