Traffic preemption system signal validation method
First Claim
1. A secure optical-communication traffic-preemption system, comprising:
- an optical emitter adapted to transmit light pulses that represent an encrypted code that is an encryption using a time-varying encryption key of at least an identification code; and
a traffic light circuit having an optical detector located at a traffic location and adapted to receive the transmitted light pulses, and a decoding circuit adapted to respond to the received light pulses by attempting to validate the included identification code and, in response to validating the included identification code, generate a traffic-preemption command for a traffic light at the traffic location.
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Accused Products
Abstract
A secure optical-communication traffic-preemption system and method is provided that securely communicates an identification code from an optical emitter to a traffic location. The optical emitter transmits light pulses that represent an encrypted code that is an encryption using a time-varying encryption key of at least an identification code. An optical detector situated at a traffic location receives the transmitted light pulses. Validation, including decryption using a time-varying decryption key, is attempted for the encrypted identification code represented within the received light pulses. In response to validating the included identification code, a traffic-preemption command is generated for a traffic light at the traffic location.
43 Citations
26 Claims
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1. A secure optical-communication traffic-preemption system, comprising:
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an optical emitter adapted to transmit light pulses that represent an encrypted code that is an encryption using a time-varying encryption key of at least an identification code; and
a traffic light circuit having an optical detector located at a traffic location and adapted to receive the transmitted light pulses, and a decoding circuit adapted to respond to the received light pulses by attempting to validate the included identification code and, in response to validating the included identification code, generate a traffic-preemption command for a traffic light at the traffic location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A detection arrangement of an optical-communication traffic-preemption system, comprising:
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an optical detector located at a traffic location and adapted to receive transmitted light pulses from an optical emitter, the transmitted light pulses including an operation identification code that is encrypted using a time-varying encryption key; and
a validation circuit coupled to the optical detector, the validation circuit adapted to store a time-varying decryption key, decrypt using the time-varying decryption key the operation identification code that is encrypted, and attempt to validate the operation identification code. - View Dependent Claims (18, 19, 20)
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21. A method for securely communicating an operation identification code to a traffic location in an optical-communication traffic-preemption system, comprising:
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encrypting the operation identification code using a time-varying encryption key;
transmitting light pulses from an optical emitter, wherein the light pulses represent the operation identification code that is encrypted;
receiving the light pulses at an optical detector situated at the traffic location;
decrypting using a time-varying decryption key the received operation identification code that is encrypted; and
validating the operation identification code that is decrypted. - View Dependent Claims (22, 23, 24, 25)
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26. A secure optical-communication traffic-preemption system, comprising:
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means for encrypting an operation identification code using a time-varying encryption key;
means for transmitting light pulses from an optical emitter, wherein the light pulses represent the operation identification code that is encrypted;
means for receiving the light pulses at an optical detector situated at the traffic location;
means for decrypting using a time-varying decryption key the received operation identification code that is encrypted; and
means for validating the operation identification code that is decrypted.
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Specification