keystream

noun

UK /ˈkiːstriːm/

US /ˈkiːstriːm/

A keystream is a long string of secret random characters used to scramble a message so nobody else can read it.

The encryption program combined the keystream with the plaintext to produce unreadable ciphertext.

SYNONYMS

cipher stream key sequence pseudorandom sequence encryption stream

RELATED WORDS

cipher encryption plaintext ciphertext cryptography

OTHER MEANINGS

2. In stream ciphers, the sequence of bits or characters generated from a key that is combined with the message data.

A weak keystream can repeat and make the cipher easy to break.

3. The output of a pseudorandom generator used in cryptographic systems to mask data.

The generator produced a fresh keystream for every new session.

4. Any continuous flow of key material used to protect transmitted data.

The radio link used a synchronized keystream to secure voice traffic.