Which algorithm was the first to be found suitable for both digital signing and encryption？（）

Whichexampleisofafunctionintendedforcryptographichashing？（）

A.MD65
B.SHA-135
C.XR12
D.MD5

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WhichoneofthefollowingitemsmaybeaddedtoapasswordstoredinMD5tomakeitmoresecure？（）

A.Ciphertext
B.Salt
C.Cryptotext
D.Rainbow table

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