| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic application system which secure the safety of a stored application document for a long period. SOLUTION: The electronic application system is provided which permits application for an electronic document from a terminal through a network, and this electronic application system has a document storage device, a means for calculating an alteration detection code from information including a document sent from the terminal, and a means for storing the information in the document storage device together with the alteration detection code. The alteration detection code is a code calculated by using a secret key held in the document storage device. Further, the system has an update means for updating the secret key and an open key when the validity of the secret key expires, a means for calculating the alteration detection code held in the document storage device by using the updated secret key, and a means for using the alteration detection code as a new alteration detection code. |
