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Definitions of authentication header:

A record containing a Ticket and an Authenticator to be presented to a server as part of the authentication process.
www.freesoft.org/CIE/RFC/1510/4.htm
The Authentication Header is a mechanism for providing strong integrity and authentication for IP datagrams. It might also provide non-repudiation, depending on which cryptographic algorithm is used and how keying is performed. For example, use of an asymmetric digital signature algorithm, such as RSA, could provide non- repudiation.
www.sec-1.com/glossary/a.html
An IPsec protocol that provides for anti-replay and verifies that the contents of the packet haven't been modified in transit. AH is a mathematical code that is embedded and transmitted in the IP packet. May be applied alone or in combination with ESP. Top
www.sequi.com/SEQUI_VPN_Glossary.htm
Used to provide connectionless integrity and data origin authentication for IP datagrams, and to provide protection against replays. This latter, optional service may be selected, by the receiver, when a Security Association is established. AH provides authentication for as much of the IP header as possible, as well as for upper level protocol data. AH may be applied alone, in combination with the IP Encapsulating Security Payload, or in a nested fashion through the use of tunnel mode.
www.usr.com/education/broadbandglossary.asp
IPsec, an abbreviation of IP security, is a standard for securing Internet Protocol (IP) communications by encrypting and authenticating all IP packets. IPsec provides security at the network layer.
en.wikipedia.org/wiki/Authentication_Header

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