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Encryption scrambles a message's contents, allowing only designated individuals to view it. There are two main types: symmetric and asymmetric encryption. Symmetric encryption involves Alice sending a sensitive document to Bob, encrypted with a password or passphrase. However, Bob cannot access the document without the passphrase, creating a dilemma for Alice on how to share it securely. Sending the passphrase via email is risky, as it could be intercepted by others, potentially allowing them to decrypt communications between Alice and Bob. This issue highlights the limitations of symmetric encryption and the need for a more secure method, which asymmetric encryption addresses.
