单项选择题

A.They use the same key for encryption and decryption o……

Which description about asymmetric encryption algorithms is correct？（）

A.They use the same key for encryption and decryption of data.
B.They use different keys for decryption but the same key for encryption of data.
C.They use different keys for encryption and decryption of data.
D.They use the same key for decryption but different keys for encryption of data.

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单项选择题Forthefollowingitems，whichonecanbeusedtoauthenticatetheIPsecpeersduringIKEPhase1？（）

A.pre-shared key
B.integrity check value
C.XAUTH
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单项选择题Inabrute-forceattack，whatpercentageofthekeyspacemustanattackergenerallysearchthroughuntilheorshefindsthekeythatdecryptsthedata？（）

A.Roughly 50 percent
B.Roughly 66 percent ActualTests.com
C.Roughly 75 percent
D.Roughly 10 percent