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The discussion focuses on digital certificates, which feature crucial digital signatures. It references a previous video on public key cryptography, highlighting the relationship between public and private keys—one can encrypt with the public key and decrypt with the private key. However, practical usage often diverges from this method, as encrypting long messages with RSA can be inefficient. Additionally, keys are typically used for extended periods, leading to a preference for more frequent key rotation in real-world encryption practices.
