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The tutorial discusses the importance of certificates, emphasizing their digital signatures that underpin their functionality. It references a previous video on public key cryptography, highlighting the relationship between public and private keys, which are inverses of each other. The speaker notes that while it's possible to encrypt messages using a recipient's public key, this method (like RSA) can be slow and impractical for lengthy messages. Additionally, there are considerations regarding key longevity and the preference for more frequent key rotation. As a result, current practices may differ for efficient encryption compared to the theoretical use of public key methods.