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The discussion focuses on the importance of certificates, which feature crucial digital signatures that support their functionality. The speaker references a previous video on public key cryptography, explaining that it involves paired keys: a public key for encryption and a private key for decryption. However, the speaker notes that while it's possible to encrypt long messages with the public key, this method is often impractical due to the slow nature of algorithms like RSA and the desire for more frequent key rotation. Consequently, alternative methods for encryption are typically used in practice.