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The video tutorial discusses the importance of digital signatures in certificates, which are generated using public key cryptography. In public key cryptography, there is a public key and a private key that are used for encryption and decryption. While encryption with public keys is possible, it is not commonly used due to its slow speed and impracticality for long messages. Additionally, keys are rotated frequently for security purposes. For actual encryption, other methods are preferred over public key encryption like RSA.