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John wants to produce a message digest of 2048-byte message he plans to send to Mary. If he uses the SHA-1 hashing algorithm, what size will the message digest for this particular message be?
1024 bits
2048 bits
160 bits
512 bits
ISC2 official study guide 7th addition. The SHA-1 hashing algorithm always produces a 160 bit message digest, regardless of the size of the input message. In fact, this fixed length output is a requirement of any secure algorithm. (pg. 926)
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