Server device with certificate revocation list acquiring function

Abstract

When a preset activation time is reached, or when a digital MFP 1 is activated manually, a determination is carried out as to whether or not a certificate revocation list is necessary to be acquired. Then, the digital MFP acquires and stores a certificate revocation list when necessary. The digital MFP determines whether or not a certificate of a signature confirmation execution list is included in the acquired certificate revocation list to determine whether or not an e-document of which a signature has been confirmed is invalid. When the e-document is invalid, the digital MFP creates text data indicating that a corresponding TSA and the e-document are invalid, and prints out the created text data by a printing unit. After deleting contents of the signature confirmation execution list, when the activated time is determined to be a preset activation time, the digital MFP is shut down.

Description

Technical field [0001] The present invention relates to a server device with a revocation list acquisition function that has the function of acquiring a certificate revocation list from a certification authority. Background technique [0002] In digital MFPs with copy function, fax function, printing function, scanning function, etc., document images scanned with scanners are recently time-stamped and saved as e-documents. That is, compared with paper documents, digital data is easy to be falsified and so on. Therefore, time stamp technology is used. In the technology of certifying the definite time of an electronic document, the time stamp is used to prove the existence of the document since when, and From this moment on, it has not been tampered with by a third party or by the producer himself. [0003] When using this time stamping technology, the hash value (also referred to as the hash value) of the electronic document is sent to the Time Stamping Authority (Time Stamping Au...

AI Technical Summary

Problems solved by technology

[0010] As mentioned above, when verifying an e-document, it is necessary to confirm the validity of the electronic certificate according to the certificate revocation list issued by the certification authority, but when downloading the certificate revocation list from the certification authority, it is always necessary to keep the device in the always-on state, It is uneconomical in terms of power consumption and lifespan of hard disk drives (HDDs), etc.

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