In public-key cryptography, the private key is kept secret by its owner and used to generate digital signatures or decrypt ciphertext. If a private key is compromised, the associated digital certificate must be revoked through a Certificate Authority (CA), and a new key pair must be generated for a replacement certificate.

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• 2018h30a #62電子証明書を発行するときに生成した秘密鍵と公開鍵の鍵ペアのうち，秘密鍵が漏えいした場合の対処として，適切なものはどれか。