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Encryption scrambles a message so only authorized individuals can read it, with two main types: symmetric and asymmetric encryption. In symmetric encryption, Alice encrypts a sensitive document with a passphrase and sends it to Bob, who cannot access it without the passphrase. This raises the issue of securely sharing the passphrase, as sending it via email could expose it to others, compromising the encryption. This dilemma underscores the need for asymmetric encryption, which addresses the challenge of secure key distribution.