Time validation system

Details Time validation system Time validation system

2007-11-13

2007-11-13

Barron, Jr., Gilberto (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C380S030000, C380S200000, C380S217000

Reexamination Certificate

active

10206245

ABSTRACT:
A system for time validation comprises a terminal (1) with means (7,7′) for tuning in to a number of different carrier frequencies (a-e), an authorisation device (6), e.g. a smart card, capable of communicating with the terminal (1) and means (2,5) to transmit time stamps, using a modulated signal having a carrier frequency, to the terminal (1). The authorisation device (6) comprises means (8) for selecting a carrier frequency to tune in to for retrieving a time stamp. A terminal (1) and authorisation device (6) are provided for use in the system. A computer program is suitable for loading into a programmable device, e.g. a smart card, to use it as an authorisation device (6) for use in such a system.

REFERENCES:
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patent: 5500897 (1996-03-01), Hartman, Jr.
patent: 5504816 (1996-04-01), Hamilton et al.
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patent: 6154206 (2000-11-01), Ludtke
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patent: WO9728649 (1997-08-01), None
patent: WO9728649 (1997-08-01), None
European Search Report Mar. 19, 2002—2 pages.

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