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Use integrity features to protect the authenticity of packets, that is, verify that
the packet was unchanged during transport over the network. Integrity features
also verify that no other packets were inserted into the packet flow.
Packet Protect uses ESP and AH algorithms (MD5 or SHA-1) to protect the
integrity of packets.
The following diagram shows two sets of packets traveling on the network. The
first set uses integrity protection; the second set does not.
Verified
packets
Unverified pack-
ets
X
X
Intruder
changes packets