Protection against manipulation of batteryless read/write transp

Details Protection against manipulation of batteryless read/write transp Protection against manipulation of batteryless read/write transp

1993-08-23

1995-07-04

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Radar transponder only

342 44, 380 23, 34082534, 34082554, G01S 1378, H04L 932

Patent

active

054304474

ABSTRACT:
A hardware and software solution for providing a tamper-proof, batteryless, remote transponder which will only be programmable by an authorized user is disclosed. This goal is achieved through the use of a hardware Cyclic Redundancy Check (CRC) generator which checks during a WRITE function of the data that is received from the Reading/Writing (R/W) unit and also generates several protection bits (Block Check Character; BCC) which are sent back during the response function (READ). Before the CRC generator checks the data during a WRITE function, however, it must be set to a predetermined start value called a Segment Code, and the Segment Code of the R/W unit must be the same as the Segment Code of the transponder in order for a Write (or a READ) to be performed. Additionally, programming of the Selective Address must be done within a predetermined time window (has a predetermined Time Code). If either the Selective Address or the BCC generated by the CRC generator is incorrect, the transponder will be discharged such that it will not respond. In addition, if the R/W unit detects that the Selective Address is being programmed at a time other than the predetermined Time Code, the reader makes the transponder inoperative in yet another way.

REFERENCES:
patent: 5022080 (1991-06-01), Durst et al.
patent: 5144667 (1992-09-01), Pogue, Jr. et al.
patent: 5164732 (1992-11-01), Brockelsby et al.
patent: 5191610 (1993-03-01), Hill et al.
patent: 5257011 (1993-10-01), Beigel
patent: 5310999 (1994-05-01), Claus et al.

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