CRYPTOLOGY CALCULATION FOR LAST USED AUTHENTICATION DEVICE
First Claim
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1. A passive start and entry system for a motor vehicle comprising:
- a control module including a transmitter for transmitting a challenge transmission and a receiver for receiving a response to the challenge transmission; and
a plurality of remote control devices, wherein the control module calculates an encrypted signal for only a last authenticated one of the plurality of remote control devices before receipt of a response signal from any of the plurality of remote controls.
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Abstract
A passive start and entry system includes a controller that determines the desired encryption for a last authenticated identification device during the period in which responses are received from any proximate identification devices. This process allows for the transmission of encrypted data to the last authenticated device without delay upon the expiration of the wait period.
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Citations
15 Claims
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1. A passive start and entry system for a motor vehicle comprising:
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a control module including a transmitter for transmitting a challenge transmission and a receiver for receiving a response to the challenge transmission; and a plurality of remote control devices, wherein the control module calculates an encrypted signal for only a last authenticated one of the plurality of remote control devices before receipt of a response signal from any of the plurality of remote controls. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of authenticating a remote control device for a passive start and entry system comprising the steps of:
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a) sending a challenge transmission from a control module; b) calculating an initial encrypted signal for a last authenticated one of a plurality of remote control devices with the control module during a wait time for a response from any of the plurality of remote control devices to the challenge transmission; and c) sending the initial encrypted signal to the last authenticated one of the plurality of remote control devices upon expiration of the wait time - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification