题目内容
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[单选题]
What is the different between digital signature mechanisms and simple encryption?()
A.Digital signatures are generally 128-bit encryption, whereas simple encryption is generally 56 bits
B.Digital signatures are verified by third parties that vouch for the veracity of the sender and the contents
C.Digital signatures carry timestamps, whereas standard encryption does not
D.Standard encryption mechanisms have no provision for traffic padding to thwart password sniffers
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