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This study shows how to use signature schemes for deniable authentication. Deniable authentication means that a message receiver R, although receiving a message m from a sender S, cannot convince a third party that the sender S has sent R the message m. If signature schemes are secure against selective forgery, the authors can construct a full deniable authentication protocol. The protocol is presented in the extension framework of Raimondo et al. as a deniable message transmission authenticator.