In Message Integrity, SHA-l hash algorithms create an N-bit message digest out of a message of
Answer: A
Correct answer: 512 Bit Blocks
SHA-1 pads the message and processes it in 512-bit blocks, updating a running state, and emits a 160-bit digest at the end. The block size and the digest size are different numbers and are often confused.
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To preserve integrity of a document, both document and fingerprint are
Answer: C
Correct answer: Needed
The check consists of comparing the fingerprint sent with the fingerprint computed from the document received, so both are required. Either one alone proves nothing.
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Why might someone break into (hack) your computer?
Answer: D
Correct answer: All of the above
All three are real motives, and the list runs from the petty to the criminal: spite, direct theft or fraud, and the use of the machine itself as a resource for distributing illegal material or attacking others. The last is the commonest and the one victims least expect, since it does no visible harm to them.
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