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Encryption scrambles a message's contents so that only authorized individuals can view it. There are two main types of encryption: symmetric and asymmetric. In symmetric encryption, like the scenario with Alice and Bob, Alice encrypts her document using a password or passphrase before sending it to Bob. However, Bob cannot access the document without the passphrase, which poses the challenge of securely sharing it. Sending the passphrase via email is risky because it could be intercepted, allowing unauthorized access to the encrypted messages between Alice and Bob. This situation highlights the limitations of symmetric encryption and sets the stage for the need for asymmetric encryption.
