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In this tutorial, Andrew Bustamante, founder of Everyday Spy and a former CIA intelligence officer, introduces the concept of ciphers, which are methods for encrypting messages. He emphasizes their historical significance and ongoing relevance, as they provide an efficient way to protect personal information, send secret messages, or conduct intelligence operations. The session focuses on a simple cipher exchange using the English alphabet, highlighting that this method can be adapted for speakers of any language. Ciphers are portrayed as effective and easy to understand, making them beneficial for various contexts.