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Encryption scrambles message contents so only authorized individuals can access them. There are two types of encryption: symmetric and asymmetric. Symmetric encryption requires a shared passphrase for decryption, exemplified by Alice wanting to share a sensitive document with Bob. Alice encrypts the document using a passphrase, but Bob cannot access it without knowing that passphrase. The challenge arises in securely sharing the passphrase, as sending it via email poses risks of interception. This scenario highlights the limitations of symmetric encryption and sets the stage for the development of asymmetric encryption, which addresses these security concerns.