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In this tutorial, Sun explains digital signatures, which serve as electronic equivalents to handwritten signatures for message verification. Digital signatures fulfill three key purposes: 1. Authentication - assures the receiver that the message is from the claimed sender. 2. Non-repudiation - prevents the sender from denying the message's origin later. 3. Integrity - guarantees that the message hasn't been altered. They are commonly utilized in software distribution, financial transactions, and email communications to protect against forgery. Sun illustrates how digital signatures work through a scenario involving Bob sending a memo to Alice, emphasizing that they use symmetric cryptography and public key algorithms.