MESSAGE EXCHANGE METHOD, AND MESSAGE CONVERSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To apply change such as addition and deletion of data to a message with an electronic signature while keeping the validity of the electronic signature.

SOLUTION: A conversion information insertion unit 21 of a computer B20 receives a message with an electronic signature imparted from a computer A10 and inserts conversion information to the message. Then the conversion information insertion unit 21 transmits a message with a conversion rule added thereto to a computer C30. A signature verification unit 31 of the computer C30 receives the message with the conversion information inserted therein from the computer B20 and verifies whether an XML signature imparted to the received message by the computer A10 is valid. When the XML signature is valid, a conversion information application unit 32 applies change such as addition or deletion of data to the message to which the XML signature is imparted on the basis of the conversion information.

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