Cryptography – Communication system using cryptography – Position dependent or authenticating
Reexamination Certificate
2004-11-13
2009-06-23
Smithers, Matthew B (Department: 2437)
Cryptography
Communication system using cryptography
Position dependent or authenticating
C713S500000, C713S501000, C701S213000, C701S219000
Reexamination Certificate
active
07551739
ABSTRACT:
An invention is provided for monitoring an item, such as a container. The invention includes a computer in communication with a receiver that receives signals from a remote source. A transmitter in communication with the computer receives values from the computer based on the signals received from the remote source. These values are then transmitted to a security device associated with the item, which includes an authentication table comprising a plurality of initial values. The security device then records values transmitted from the transmitter. The values can be jitter values, with each jitter value being a difference in arrival times of at least two timing signals from the same remote source.
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Dube Roger R.
Morgenstern Richard L.
Brock, II Joe A.
Callahan Paul
Digital Authentication Technologies, Inc.
Patent Venture Group
Smithers Matthew B
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