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Why must the encryption sequence of a stream cipher have a large period?

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What is a major risk associated with a short cycle length in key-streams generated by pseudorandom generators?

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What is a correlation attack in the context of stream ciphers?

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What type of attack is a substitution attack?

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Which attack on stream ciphers is known from the Wired Equivalent Privacy (WEP) protocol?

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What is the primary concern with using a reused key in a stream cipher?

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Which of the following actions might a legitimate user who misuses privileges take?

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What is the process used to identify intrusions and/or intrusion attempts?

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What did the intruder problem lead to the establishment of?

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What is the difference between IDS and IPS?

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