Security system with randomized synchronization code

Details Security system with randomized synchronization code Security system with randomized synchronization code

1997-08-15

2000-08-01

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

3408253, 34082504, 34082569, 341176, 455 95, 455 97, G07D 700

Patent

active

060973072

ABSTRACT:
A transmitting unit of a wireless security system having randomized successive ("rolling") verification codes transmits a different synchronization code each time that the transmitter unit is powered up. After power up, a pseudo-random value is generated by a pseudo-random number generator. The pseudo-random value is at least in part dependent upon a manipulation of a manually-operable switch of the transmitting unit. The pseudo-random value is incorporated into the first synchronization code transmitted after the first power up. If power to the transmitting unit is then interrupted and then resupplied, for example by removing and then replacing a battery, then the pseudo-random number generator generates another pseudo-random value, the value again depending at least in part upon a manipulation of the manually-operable switch. The pseudo-random value is then incorporated into the first synchronization code transmitted after the second power up. The first verification code used to gain access to the automobile is generated based on an initially fixed start value specific to the transmitting unit as well as on the initially randomized pseudo-random value.

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