note

Reversing 23 numbers one by one using the modular inverse of 41 | picoCTF "basic-mod2" writeup Japanese explanation

I will explain three problems from the CyLab Security Academy (formerly picoCTF) Cryptography section. The problems covered are "13", "basic-mod1", and "basic-mod2". All three problems involve ...
note

Reverse-engineering the key 'flag' from the last 7 characters in a polyalphabetic cipher | picoCTF 'la cifra de' writeup Japanese explanation

This is an explanation of the Cryptography challenge 'la cifra de' from CyLab Security Academy (formerly picoCTF). When you connect to the server via nc, you receive a piece of English text. Even if ...
letsdatascience

GPT-6 Astra Decodes 1809 Napoleonic Cipher

Carter Church, an AI engineer at SentinelOne, used OpenAI's GPT-6 Astra to transcribe and decipher a 1809 French military ...