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ISCW356
#1
This question's been confusing me a bit.

From what I've been reading, in this scenario: tunnel mode with ESP_SHA_HMAC as integrity and ESP_AES_256 as the encryption algorithm then everything after the ESP trailer (ie the orginal packet including its IP header) will be encrypted and hashed - but the new IP header won't be either (you would need AH to hash that header).

So this suggests to me that the right answer is:

"Only the data field of the packet will be encrypted..."

Am I on the wrong track here?
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