For those interested in reading up on the IPSEC work, check out ds.internic.net's "internet-drafts" directory. The following are the drafts that you will want to look at. draft-ietf-ipsec-ah-md5-03.txt draft-ietf-ipsec-arch-02.txt draft-ietf-ipsec-auth-02.txt draft-ietf-ipsec-esp-01.txt draft-ietf-ipsec-esp-des-cbc-04.txt draft-ietf-ipsec-photuris-02.txt I believe that the -ah-xx.txt draft is missing. Perry