| 摘要 |
PURPOSE:To prevent a verifying personnel from running away with an electronic signature of a signer by devising a digital signature in such way that a specific condiction is to be satisfied. CONSTITUTION:The identification of the concerned personnel is checked twice by executing the confirmation of sender/recipient, addition of certification of contents, provision of pass code and the fact of reply of a terminal equipment as procedures of the transaction. Then the additional verification personnel of a tally impression sending procedure from the verification personnel to a signer receives a massage M from the signer, confirms the content of the message M and approves of the transaction. In this case, the face that a high-order bit string h1 in a compressed ciphered text of the message M is included in the tally impression generated by the verification personnel only is to be confirmed. Thus, the fact is used for a proof if the verification personnel negates the existence of the transaction at the exchange of the electronic signature, does not reply the electronic signature of the verification personnel as a reply and runs away with the electronic signature of the signer. |
