Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2011-06-07
2011-06-07
Barron, Jr., Gilberto (Department: 2432)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S168000, C713S176000, C380S246000
Reexamination Certificate
active
07958367
ABSTRACT:
When a document creation unit1is started, it calculates a hash value of each software piece therein and stores the hash value in a hash value holder71and a measurement log document holder44. The document creation unit1accesses a time distribution unit plural times to receive time information therefrom, and records the time information in a log document and a measurement log document. The document creation unit1transmits the log document, the measurement log document, and digital signature-embedded hash value information (measurement auxiliary document) in a tamper-resistant device63to a document reception device. The document reception device verifies matching of the hash values or digital signature in the document group, confirms software operating environments in the document creation unit1from the hash values, and determines whether the time information is correctly managed within the unit1.
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Adams, C. et al., “Internet X. 509 Public Key Infrastructure Time-Stamp Protocol,” Request for Comments (RFC) 3161, Aug. 2001.
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Akutsu Takeshi
Fujishiro Takahiro
Mishima Hisanori
Uesugi Tadaoki
Barron Jr. Gilberto
Hitachi , Ltd.
McDermott Will & Emery LLP
Nobahar Abdulhakim
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