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Deniable authentication can authenticate messages like digital signatures,and its non-public verification can meet many requirements that cannot be met by signatures,such as privacy preservation.How to achieve deni-able authentication with multi-party protocol was the study aim.A deniable authentication for multi-party protocol using string commitment scheme was proposed.As a generic method,it can pass the most of protocol to deniable protocol,such as the deniable group key agreement protocol.The adversarial model was formalized and the security was proved strictly.The research content provide a new idea for studying deniable authentication.