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So sudden ________ that the enemy had no time to escape.
A. did the attack B. the attack did C. was the attack D. the attack was
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There are two general approaches to attacking a ( )encryption scheme.The first attack is known as cryptanalysis.Cryptanalytic attacks rely on the nature of the algorithm plus perhaps some knowledge of the general characteristics of the ( ) or even some sample plaintext-ciphertext pairs. This type of (请作答此空 ) exploits the characteristics of the algorithm to attempt to deduce a specific plaintext or to deduce the key being used. If the attack succeeds in deducing the key, the effect is catastrophic: All future and past messages encrypted with that key are compromised. The second method, known as the ( )-force attack, is to try every possible key on a piece of ( ) until an intelligible translation into plaintext is obtained. On average, half of all possible keys must be tried to achieve success.
A. message
B. knowledge
C. algorithm
D. attack
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There are two general approaches to attacking a ( )encryption scheme.The first attack is known as cryptanalysis.Cryptanalytic attacks rely on the nature of the algorithm plus perhaps some knowledge of the general characteristics of the ( ) or even some sample plaintext- ciphertext pairs. This type of ( 3 ) exploits the characteristics of the algorithm to attempt to deduce a specific plaintext or to deduce the key being used. If the attack succeeds in deducing the key, the effect is catastrophic: All future and past messages encrypted with that key are compromised. The second method, known as the ( )-force attack, is to try every possible key on a piece of ( ) until an intelligible translation into plaintext is obtained. On average, half of all possible keys must be tried to achieve success.
（3）应选__________.
A. message
B. knowledge
C. algorithm
D.attack
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All the following sentences areconditional sentence except ___________.A.Given another chance, I' 11 make full useof it.
B.He will succeed if he only does his best.
C.So sudden was the attack that we had notime to escape.
D.Should you need my help again, just giveme a ring.
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needn’tB
may notC
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none of the above
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Very few witnesses were at the site.B
A lot of witnesses have been interrogated seriously.C
Some witnesses were inside the academy during the attack.D
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By means ofC
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offB
awayC
overD
in
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brutal attack in South WaziristanC
assassination of former PM Benazir BhuttoD
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She made more appearances on TV.B
She paid no attention to them.C
She met the 13-year-old girl as planned.D
She launched an attack on the members of the British government.
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