To broad that draw up and renew such as where do point the thing of the information which show the day and where "" in the electronic data of the file such as, in narrow sense "grant accurate day and information depend to the third party agency vis-a-vis the electronic data, do, do the existence proof and non alteration proof of the electronic data at that point in time the mechanism or technology" it point.
When it draws up the file generally on the computer, renews, the file system of OS and the like records the day and time where the operation was done as file attribute. With E-mail transmission day and time of that mail and passing day and time etc. of the relay server are recorded to the header. With the Web server and the network management software records the time which has the access to the system and, even with business application other than that and the middleware to be some operation, as the log data those which record the day and time where the event occurs are many. Information of these day and time times is called "time stamp".
But, the day and time which this kind of time stamp shows depends on the internal clock of the computer, it is accurate always and also is not secure.
For example when the electronic bill and the contract etc. are exchanged with electronic commerce, because the day and time which is recorded to those is claim day and contract day, reliability of day and time information of the electronic data becomes problem.
Vis-a-vis such important electronic data, the mechanism or the technology which grants the time which reliance can be put is called "time stamp". Especially,with PKI, in order existing in the time which is the electronic data (existence proof), and modification and alteration without being done from now on its time (original copy characteristic guarantee) to prove, it grants time information and the like to hash value of the electronic data,it meansthat you sign electronically.
It made on the basis of the digitalized signature of PKI that most it is known as a international standard of time stamp technology "IETF RFC 3161 (Time Stamp Protcol)" with with the standard which is said, protocol of time stamp, and the data format of time stamp request response have been defined. Even in addition there is "ISO/IEC 18014", but it is something where this designates RFC 3161 as the base.
Other than electronic commerce and online shopping, the release document whose compliance characteristic is high (are thought) adaptation toproofand such as intellectual property protection such as IR information as a utilization range of time stamp. Electronic authenticationand electronic signaturemethod and time stamp with necessary ones, aresome where utilization of time stamp is required in part Ministerial ordinance in the document where electrization is permitted with e- document law. |
