The Red Cell Cipher Challenge is a project that aims to grow into a scaled-down version of the NSA codebreaker challenge. The NSA codebreaker challenge is an annual set of problems designed to display participants’ skill in cryptanalysis, reverse engineering, and other areas. For our Cipher Challenge, we’ll produce new puzzles each month to test, help improve, or develop cryptographic skills in our members. Stay tuned for the 2026-2027 challenge!
No more puzzles for now! See you next year!