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Stream ciphers, in contrast to the ‘block’ type, create an arbitrarily lengthy stream of key material, which is combined with the plaintext bit-by-bit or character-by-character, considerably just like the one-time pad In a stream cipher, the output stream is created primarily based on a hidden inside state that changes because the cipher operates. technology information That internal state is initially set up using the key key material. RC4 is a widely used stream cipher. 4 Block ciphers can be utilized as stream ciphers.