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What is provided by the Secure Hash Algorithm in a VPN?
Correct Answer: A
The HMAC-SHA-1-96 (also known as HMAC-SHA-1) encryption technique is used by IPSec to ensure that a message has not been altered. (-> Therefore answer "integrity" is the best choice). HMAC-SHA-1 uses the SHA-1 specified in FIPS-190-1, combined with HMAC (as per RFC 2104), and is described in RFC 2404. Reference: https://www.ciscopress.com/articles/article.asp?p=24833&seqNum=4