You may find the history of the first large-scale digital computer interesting. https://www.amazon.com/Colossus-secrets-Bletchley-code-breaking-computers-ebook

You may find the history of the first large-scale digital computer interesting. https://www.amazon.com/Colossus-secrets-Bletchley-code-breaking-computers-ebook/dp/B000SF3IEC https://www.amazon.com/Colossus-secrets-Bletchley-code-break... It was used by the British to break the Lorenz cipher (which the Nazis used to encrypt high-level strategic communications.)