Cipher Shifts in Diplomacy: Zimmermann Telegram Intercepted Message That Pulled America Into World War One

The first mechanism examined is the intelligence interception and decryption pipeline, which transformed a routine diplomatic cable into actionable strategic knowledge. British Room 40's ability to decrypt the telegram relied on captured codebooks and the reuse of older German ciphers, demonstrating how lapses in cryptographic hygiene can expose sensitive communications to adversaries. This created a feedback loop where the sender's assumption of code security was undermined, altering the c...