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Encryption scrambles a message's content so only specific individuals can access it. Two main types of encryption exist: symmetric and asymmetric. Symmetric encryption is illustrated through Alice and Bob's scenario. Alice encrypts a sensitive document using a password and sends it to Bob, but he cannot access it without the passphrase. The challenge arises in how Alice securely shares the passphrase with Bob, since sending it via email is risky as it could be intercepted. This situation highlights the fundamental problem asymmetric encryption was designed to solve.