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Encryption is the process of scrambling a message to ensure only certain individuals can access its contents. There are two main types of encryption: symmetric and asymmetric. In symmetric encryption, like Alice sharing a sensitive document with Bob, Alice encrypts her document with a password and sends it to Bob. However, Bob cannot access the document without the passphrase, which Alice needs to share securely. Sending the passphrase via email poses risks, as it could be intercepted by others, highlighting the challenge of securely sharing keys in symmetric encryption. This necessity led to the development of asymmetric encryption.