Key (cryptography)

In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher.

Encryption

In encryption, a key specifies the particular transformation of plaintext into ciphertext.

Decryption

In decryption. a key specifies the particular transformation of ciphertext into plaintext into ciphertext.

No key, no result

Without a key, the algorithm would produce no useful result.

Keys in other cryptographic algorithms

Keys are also used in other cryptographic algorithms, such as digital signature schemes and message authentication codes.

See also

• Algorithm
• Ciphertext
• Cryptographic algorithm
• Cryptography
• One-time pad
• Plaintext

External links

• Key (cryptography) @ Wikipedia