public-key encryption

cryptography (PKE, Or "public-key cryptography") An

encryption scheme, introduced by Diffie and Hellman in 1976,

where each person gets a pair of keys, called the public key

and the private key. Each person's public key is published

while the private key is kept secret. Messages are encrypted

using the intended recipient's public key and can only be

decrypted using his private key. This is often used in

conjunction with a digital signature.

The need for sender and receiver to share secret information

(keys) via some secure channel is eliminated: all

communications involve only public keys, and no private key is

ever transmitted or shared.

Public-key encryption can be used for authentication,

confidentiality, integrity and non-repudiation.

RSA encryption is an example of a public-key cryptosystem.

alt.security FAQ.

See also knapsack problem.

(1995-03-27)