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The tutorial discusses the importance of digital signatures on certificates, which are crucial for security. It references a previous video on public key cryptography, explaining that each individual has a public and a private key that function as inverses. While it's possible to encrypt messages with a public key for secure communication, this method (like RSA) can be slow and impractical for lengthy messages. Additionally, since keys are used for extended periods, there's a preference for key rotation. The tutorial emphasizes these points as foundational concepts for understanding the role of certificates in digital security.