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公开(公告)号：JPH10106149A
公开(公告)日：1998-04-24
申请号：JP19345597
申请日：1997-07-18
Applicant: IBM
Inventor： BENNET CHARLES H , DIVINCENZO DAVID P , LINSKER RALPH
Abstract: PROBLEM TO BE SOLVED: To prevent forgery of a record by periodically receiving a challenge from an approval source by a camera or a recording device. SOLUTION: Unpredictable digital signal and challenge are periodically and simultaneously communicated by the approval source 10. These are received and stored by an approval challenge repository 20. Simultaneously, these are also received by a video camera assembly 25, and video signal 50 is digitalized by a digitalizer 55 and is stored in a large capacity storage medium 60 for the purpose of retrieval later on. Then, this output of the means 55 is also supplied to a digester 65, and is digested by using a hash function, so as to be transmitted via a transmitting means 70 to an approval digest repository 75, where the digested digital signal is stored together with its receiving time and other identification information. Consequently, when a length between recording time and certification time is shortened, a forger is asked for a large amt. of information, and hence simulation of recording the challenge in real time cannot be performed in such a brief time.
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公开(公告)号：DE69719630T2
公开(公告)日：2003-11-20
申请号：DE69719630
申请日：1997-07-01
Applicant: IBM
Inventor： BENNET CHARLES H , DIVINCENZO DAVID P , LINSKER RALPH
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公开(公告)号：DE69719630D1
公开(公告)日：2003-04-17
申请号：DE69719630
申请日：1997-07-01
Applicant: IBM
Inventor： BENNET CHARLES H , DIVINCENZO DAVID P , LINSKER RALPH
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