The second cryptanalysis challenge in the Ksi sequence is now up at
https://github.com/eleemosynator/challenges/tree/master/ksi.
It's an updated version of the Ksi cipher, but still pretty easy to crack.

challenges/ksi at master · eleemosynator/challenges
Reverse Engineering and Cryptanalysis challenges. Contribute to eleemosynator/challenges development by creating an account on GitHub.
GitHubMy write-up for
#flareon9 challenge 07 (anode) using a Divide and Conquer cryptanalysis, as well as reversing out the initial state of the RNG in anode and finding all the patches to the binary.
https://github.com/eleemosynator/writeups/tree/master/flare-on-9/07_anode
writeups/flare-on-9/07_anode at master · eleemosynator/writeups
Write-ups for crackmes and CTF challenges. Contribute to eleemosynator/writeups development by creating an account on GitHub.
GitHub