Abstract: This disclosure relates to the ability to use multiple claim transformation modules in a trust relationship. Claim transformation modules transform a claim or claim set into a transformed claim or claim set for use by a trusted partner and/or application. Multiple claim transformation modules may be given the opportunity to act on a claim or claim set in a pipelined fashion. In another embodiment, multiple claim transformation modules may exist, but only the proper claim transformation module(s) is(are) given the opportunity to act on a claim or claim set. In an embodiment, the claims involved are security claims used for authentication purposes between trust partners in a federated authentication system.