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In this lesson, the tutorial discusses asymmetric encryption, which involves a key pair consisting of a public key and a private key for each user. Using the characters Pam and Jim as examples, Pam shares her public key with Jim, while keeping her private key secure. Similarly, Jim has his own public and private keys. The key principle is that data encrypted with one user's public key can only be decrypted using their corresponding private key, and the reverse is also true. The tutorial implies that this system enables secure data exchange between users, illustrating how Jim can send a message to Pam using her public key.
