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'''Public-key encryption''' is an [[encryption]] method in which both the encryption key is public. There is a private key used known only to the individual. This differs from the traditional (so-called "private-key") encryption, in which the key is kept secret from the intended recipient. Public-key encryption is a form of ''[[symmetry|asymmetric]] encryption'', meaning that it is much easier to encrypt a message than to decrypt it, at least without knowing the decryption key.

'''Public-key encryption''' is an [[encryption]] method in which the encryption key is public. There is a private key used known only to the individual. This differs from the traditional (so-called "private-key") encryption, in which the key is kept secret from the intended recipient. Public-key encryption is a form of ''[[symmetry|asymmetric]] encryption'', meaning that it is much easier to encrypt a message than to decrypt it, at least without knowing the decryption key.

Well-known public-key encryption algorithms include '''Diffie-Hellman''' and '''RSA'''. In Diffie-Hellman, the hardness is based on the [[discrete logarithm]]; in RSA it is [[factoring]].

Well-known public-key encryption algorithms include '''Diffie-Hellman''' and '''RSA'''. In Diffie-Hellman, the hardness is based on the [[discrete logarithm]]; in RSA it is [[factoring]].