Encryption

Encryption is the act of transforming a plaintext into a ciphertext. The opposite process is decryption.

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

References

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