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Encryption is the process of scrambling a message so that only authorized individuals can view it. There are two types of encryption: symmetric and asymmetric. In symmetric encryption, as illustrated by Alice and Bob, Alice uses a password to encrypt a sensitive document and sends it to Bob. However, Bob cannot access the document without knowing the passphrase. The challenge arises in securely sharing this passphrase, as sending it via email poses risks of interception. This scenario highlights the limitations of symmetric encryption and sets the stage for understanding the need for asymmetric encryption to address such security concerns.