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Encryption is the process of scrambling a message so that only specific individuals can access it. There are two types: symmetric and asymmetric encryption. Symmetric encryption involves Alice, who encrypts a sensitive document with a password and sends it to Bob. However, Bob cannot access the document without the passphrase used by Alice. The challenge arises in securely sharing this passphrase, as sending it through email poses a risk of interception. This situation highlights the need for a more secure method to share encryption keys, which leads to the development of asymmetric encryption.