<*cryptography*> As opposed to public-key cryptography, a
cryptographic method in which the same key is used to encrypt
and decrypt the message. Private-key algorithms include the
obsolescent Data Encryption Standard (DES), triple-DES
(3DES), the Advanced Encryption Standard (AES), also known
as Rijndael, Blowfish, Twofish RC2, RC4, RC5 and RC6.

A problem with private-key cryptography is that the sender and the recipient of the message must agree on a common key via some alternative secure channel.

Public-key cryptography gives an answer to this problem.

Last updated: 2008-02-07

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**Nearby terms:**
Private Automatic Branch eXchange « Private Branch Exchange « private key « **private-key cryptography** » Private Manual Branch eXchange » privileged instruction » PRL

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Copyright Denis Howe 1985