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Why does a stream cipher have to be deterministic?
Why does a stream cipher have to be deterministic?
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A stream cipher has to be deterministic to ensure that the encryption and decryption results are consistent and predictable. In a stream cipher, a key stream is generated, which is then combined with the plaintext bit by bit to produce the ciphertext. If the cipher were non-deterministic, it would produce different key streams for the same input, leading to inconsistent and unpredictable ciphertexts. This would render the encryption and decryption process unreliable and hinder the secure communication between parties. Thus, determinism is essential to maintain the integrity and effectiveness of a stream cipher.
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