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The video tutorial discusses the importance of digital signatures in certificates, which are fundamental to the security process. It references Rob's prior video on public key cryptography, highlighting the relationship between public and private keys, where one encrypts and the other decrypts. Although theoretically, one could encrypt messages using a public key, it's not commonly practiced due to the inefficiency of algorithms like RSA for lengthy messages. Additional reasons include the desire for key rotation and the extended use of these keys in practice. Overall, the focus shifts towards more efficient encryption methods rather than direct public key encryption.
