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Encryption scrambles a message's contents so only certain people can access it. There are two types of encryption: symmetric and asymmetric. In symmetric encryption, a message is encrypted with a passphrase chosen by the sender, like Alice, who wants to share a sensitive document with Bob. The encrypted document can be sent to Bob, but he can't open it without knowing the passphrase. The challenge arises in securely sharing this passphrase, as sending it via email poses risks of interception, allowing unauthorized parties to decrypt messages between Alice and Bob. This issue highlights the need for asymmetric encryption.