What German code did colossus decipher?

Colossus, the world's first programmable digital computer, was used by British codebreakers during World War II to help decipher the Lorenz cipher. This cipher was employed by the German military for high-level communications, specifically by the German Army's High Command. Colossus processed and analyzed the encrypted messages, significantly contributing to the Allied efforts by providing critical intelligence. Its success in breaking the Lorenz cipher marked a pivotal advancement in cryptography and computing.