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Security system

  • US 20040137877A1
  • Filed: 02/03/2003
  • Published: 07/15/2004
  • Est. Priority Date: 08/25/2000
  • Status: Abandoned Application
First Claim
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1. A security system (4, 8), including an electronic key (4) having a transmitter (6) and a secure object having a base station (8) which has a receiver (10), the transmitter (6) and the receiver (10) being designed so that they communicate to exchange authentication data, wherein the key (4) transmits the data in a message which includes parts each having predetermined periods (T0, . . . , T4) having transmission signal variations;

  • and the base station (8) detects distortion in the transmission signal variations due to a relay station.

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