March 5, 2002
Practical Aspects of Modern Cryptography
46
IPSEC Authentication Header (AH)
in Transport Mode
Data
TCP Hdr
Orig IP Hdr
Data
TCP Hdr
AH Hdr
Orig IP Hdr
Next Hdr
Payload Len
Rsrv
SecParamIndex
Keyed Hash
Integrity hash coverage (except for mutable fields in IP hdr)
Seq#
24 bytes total
AH is IP protocol 51
Insert