Public-key encryption is an asymmetric cryptographic method that uses a pair of mathematically linked keys: a public key for encryption and a private key for decryption. The public key may be freely distributed, while the private key must be kept secret by its owner. This approach is widely used in secure communications and is often combined with symmetric-key encryption for efficiency.

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• 2014h26a #77暗号化通信で使用する鍵a～cのうち，セキュリティ上，第三者に知られてはいけないものだけを全て挙げたものはどれか。 a 共通鍵暗号方式の共通鍵 b 公開鍵暗号方式…