Schneier on Security: 1965 Cryptanalysis Training Workbook Released by the NSA. “The listings in the report are printouts from the Stethoscope program, run on the NSA’s Bogart computer, showing statistical and structural data extracted from encrypted messages, but the encrypted messages themselves are not included. They were used in NSA training programs to teach analysts how to interpret […]

https://rbfirehose.com/2025/09/04/schneier-on-security-1965-cryptanalysis-training-workbook-released-by-the-nsa/

Does this already look unreadable to you?

#Ciphertext is nothing else than unreadable data. To decipher it, you need the #key. 🔑

Interestingly enough, already Ancient Greeks used ciphers.

Learn how they did it and what has changed since: https://tuta.com/blog/what-is-ciphertext

The third step in Cryptopals needs you to detect English text, specifically the immortal words of poet Vanilla Ice.

I think I’m seriously overthinking this. I’ve got one that works for step 3, but step four is “find the English in these 370-ish lines of ciphertext. And I’m not getting close.

#cryptopals #ciphertext #frustration