Measuring and testing – Instrument proving or calibrating – Timing apparatus
Patent
1995-06-02
1999-08-10
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Timing apparatus
368202, H04K 100
Patent
active
059361492
ABSTRACT:
A personal data/time notary device is embodied in a token device such as a "smart card". The portable notary device includes an input/output (I/O) port, which is coupled to a single integrated circuit chip. The I/O port may be coupled to a conventional smart card reading device which in turn is coupled to a PC, lap-top computer or the like. A tamper resistant secret private key storage is embodied on the chip. The private key storage is coupled to the processor which, in turn, is coupled to a permanent memory that stores the program executed by the processor. At least one clock is embodied on the card. A second clock 14 and a random value generator 10 are also preferably coupled to the processor. The device combines digital time notarization into a digital signature operation to ensure that a time stamp is always automatically present. The user does not need to be involved in any additional decision making as to whether time stamping is necessary.
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Jahrbuch Der Deutschen Gesellschaft Fur Chronometrie, vol. 25, No. 2, Feb. 1974, Stuttgart De, pp. C12-1 C12-9, Burth `Die Rationelle Ermittlung Des Optimalen Abgleiches Bei Quarzuhren Mit Der Integrierten Schaltung Saj 310`, p. C6, line 1-p. C7, line 9; Figure 3.
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