(cryptography) A symmetric structure used in the construction of block ciphers. It is an iterated cipher with an internal function called a round function.

plural of stream cipher

plural of Vigenère cipher

plural of Playfair cipher

plural of ciphertext

Encoded text, text that is unreadable.

Resembling or characteristic of a cipher.

nothingness

(cryptography) An attack on a cryptosystem that relies only on the attacker's knowledge of some ciphertexts encrypted with that system and key. Less powerful than a known-plaintext attack.

(cryptography) An attack on a cryptosystem that relies on the attacker's ability to choose any ciphertext of their liking and decrypt it into the corresponding plaintext with that system and key. More powerful than a chosen-plaintext attack.