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We consider a framework where agents perform trust formation on behalf of human users in open environment like pervasive computing or the Internet. In this paper, an automated trust negotiation framework by van der Host et al. (2004) is proposed, to support such trust agents, and a protocol is presented. In the framework, the preference for the disclosure of credentials and policies are explicitly included in contrast to ordinary ATN frameworks studied in network authentication domain. The proposed protocol is based on dynamic programming and successfully performs the exchange of credentials and policies without unnecessary disclosure of them.