Decryption

Decryption is the act of transforming a ciphertext into a plaintext. The opposite process is encryption.

Let K be a set of keys, M be a set of plaintext messages, and C be a set of ciphertext messages. The bijection Dk:C→M, where k∈K, is a decryption function or decryption transformation.

References

L. R. Knudsen, M. J. B. Robshaw, The Block Cipher Companion. Springer, 2011.