private-key cryptography


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private-key cryptography

(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 emitter and the recipient of the message must agree secretly on a common key beforehands; but how can they do so?

Public-key cryptography gives an answer to this problem.

private-key cryptography

Typically refers to secret-key cryptography, which uses the same secret key. However, the use of the term "private" is confusing, because in public key cryptography (a different architecture), a "private key" is used. See cryptography.
References in periodicals archive ?
In private-key cryptography, a single key is used for both encryption and decryption.
Because digital signature technology is based on dual public- and private-key cryptography, I can have a secure and trusted relationship with multiple entities.
They exist regardless of the design of the recovery systems - whether the systems use private-key cryptography or public-key cryptography; whether the databases are split with secret-sharing techniques or maintained in a single hardened secure facility; whether the recovery services provide private keys, session keys, or merely decrypt specific data as needed; and whether there is a single centralized infrastructure, many decentralized infrastructures, or a collection of different approaches.