An administrator intends to configure an IPSec solution that provides ESP with integrity protection,
but not confidentiality protection. Which of the following AES modes of operation would meet this
integrity-only requirement?
A.
GMAC
B.
PCBC
C.
CBC
D.
GCM
E.
CFB
Answer “A” should read HMAC not GMAC
Yes I think your right it should be HMAC
The author is insane! You can not put GMAC rather than HMAC as the choice. I spent over 5 minutes and I still have no idea how to answer this question.
https://en.wikipedia.org/wiki/GMAC
Thanks for the contribution of ephs81 and bobh61. Now, I see it is HMAC.