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Which type of cipher operates in real time?
Stream
Rolling Block
Continuous Block
Symmetrical
The correct answer is a stream cipher, which processes a flow of data in real-time. A block cipher processes blocks of data, not in real-time. Continuous block is not a cipher mode. While Symmetrical could be true - stream ciphers are in many cases symmetrical key cryptosystems - it isn't relevant to the meaning of the question.
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