Noun
keystream (plural keystreams)
(cryptography) A stream of random or pseudorandom characters that are combined with the plaintext to produce a ciphertext.
A one-time pad uses a keystream of completely random digits. Source: Internet
A stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream ( keystream ). Source: Internet
In the most common form, binary digits are used ( bits ), and the keystream is combined with the plaintext using the exclusive or operation (XOR). Source: Internet
Description RC4 generates a pseudorandom stream of bits (a keystream ). Source: Internet
Klein's attack In 2005, Andreas Klein presented an analysis of the RC4 stream cipher showing more correlations between the RC4 keystream and the key. Source: Internet
However, the keystream must be generated completely at random with at least the same length as the plaintext and cannot be used more than once. Source: Internet