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Encryption transforms a message into a scrambled format that can only be deciphered by specific individuals. There are two main types of encryption: symmetric and asymmetric. Symmetric encryption involves a scenario with Alice and Bob, where Alice encrypts a sensitive document using a chosen password and sends it to Bob. However, Bob is unable to access the document because he lacks the decryption key (the passphrase). The challenge arises in securely sharing this passphrase with Bob, as sending it via email is risky; others might intercept it and gain access to the messages. This situation highlights the need for a more secure method of sharing keys, which is the problem that asymmetric encryption seeks to address.