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The present invention allows even small-size verificationdevices to authenticate rights and qualifications without leakingauthentication characteristic information to third parties A ticketissuance device computes document private information mufrom a private function f of an interaction device owned by auser and document m to be transferred to the interaction device when generating interaction,and issues ticket t generated fromauthentication characteristic information x and the documentprivate information .mu. to the user.The interaction device,when document m is input,generates document private infor-mation mu using a private function f specific to the interactiondevice,and performs interaction based on the document privateinformation.The interaction comprises output of commitment r.input of challenge chi,output of response .sigma.,andmessage M output.The user converts interaction(r, .chi.,M,.sigma.)into interaction(r,.chi.,M,s)using ticket t toperform Guillou-Quisquater authentication.
The present invention allows even small-size verification of services to authenticate rights and qualifications without leakingauthentication characteristic information to third parties A ticket issuance device computes document private information mufrom a private function f of an interaction device owned by auser and document m to be transferred to the interaction device when generating interaction, and issues tickets t generated fromauthentication characteristic information x and the document private information .mu. to the user. interaction device, when document m is input, generating document private infor-mation mu using a private function f specific to the interaction device , and perform interaction based on the document private information. The interaction comprises output of commitment r. input of challenge chi, output of response. sigma., and message M output. user of user interaction (r, .chi., M, .sigma. ) into interaction (r, .chi., M, s) using ticket t toperform Guillou-Quisquater authenticati on.