PROBLEM TO BE SOLVED: To provide an encryption protocol converter that enhances security for information transmission reception furthermore and can precisely authenticate a communication opposite party, and to provide an encryption protocol conversing method and a recording medium recording an encryption protocol conversion program.;SOLUTION: Encryption devices 21, 23 of an intermediate device 2 encrypt furthermore encrypted information sent/received between a client device 1 and a server device 3 so as to enhance the security, and a certificate authentication device 25 of the intermediate device 2 authenticates a certificate added to the encrypted information received from the server device 3, a certificate generator 27 generates a new certificate on the basis of the authentication result and the generated certificate is transmitted to the client device 1.;COPYRIGHT: (C)2000,JPO
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