Remote-control security system and method of operating the same
First Claim
1. A security system, comprising a first unit for transmitting encoded signals, said first unit having switch means, and first calculating means for performing an algorithm in response to each actuation of said switch means so that, upon the nth actuation of said switch means, said first calculating means generates an n-times modified security code obtained by operating with said algorithm n times beginning from a starting security code, said first unit also having first emitting means for emitting an encoded signal, which includes said starting code and a respective n-times modified code, in response to each actuation of said switch means;
- and a second unit having second calculating means for performing said algorithm in response to each encoded signal arriving at said second unit so that, upon arrival of an encoded signal at said second unit, said second calculating means generates an m-times modified security code obtained by operating with said algorithm m times beginning from an initial security code, said second unit additionally having comparing means for comparing the starting code of each encoded signal arriving at said second unit with said initial code and for comparing the n-times modified code of each encoded signal arriving at said second unit with the corresponding m-times modified code, and said second unit further having second emitting means emitting a control signal for when and only when the starting code of an encoded signal arriving at said second unit is identical to said initial code and the n-times modified code of the signal is identical to the corresponding m-times modified code.
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0 Petitions
Accused Products
Abstract
A security system has a remote-control unit, a receiving unit and an operating unit connected to the receiving unit and designed to perform a security function. The remote-control unit comprises a keyboard, an encoder and a transmitter. The encoder is programmed with an algorithm and a base code and, in response to consecutive actuations of the keyboard, operates consecutively with the algorithm, beginning from the base code, to generate a series of modified codes. The encoder also produces a corresponding series of encoded signals containing the base code and a respective modified code. The encoded signals are sent to the receiving unit by the transmitter. The receiving unit includes a receiver for the signals and a decoder which is activated in response to an incoming signal. The decoder is programmed with the same algorithm and base code as the encoder and, similarly to the encoder, generates a series of modified codes in response to consecutive incoming signals. After the decoder generates a modified code upon being activated by an incoming signal, the decoder compares its base code and modified code, respectively, with the base code and modified code of the signal. The decoder sends a control signal to the operating unit if and only if the two base codes are identical and the two modified codes are identical.
134 Citations
19 Claims
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1. A security system, comprising a first unit for transmitting encoded signals, said first unit having switch means, and first calculating means for performing an algorithm in response to each actuation of said switch means so that, upon the nth actuation of said switch means, said first calculating means generates an n-times modified security code obtained by operating with said algorithm n times beginning from a starting security code, said first unit also having first emitting means for emitting an encoded signal, which includes said starting code and a respective n-times modified code, in response to each actuation of said switch means;
- and a second unit having second calculating means for performing said algorithm in response to each encoded signal arriving at said second unit so that, upon arrival of an encoded signal at said second unit, said second calculating means generates an m-times modified security code obtained by operating with said algorithm m times beginning from an initial security code, said second unit additionally having comparing means for comparing the starting code of each encoded signal arriving at said second unit with said initial code and for comparing the n-times modified code of each encoded signal arriving at said second unit with the corresponding m-times modified code, and said second unit further having second emitting means emitting a control signal for when and only when the starting code of an encoded signal arriving at said second unit is identical to said initial code and the n-times modified code of the signal is identical to the corresponding m-times modified code.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of operating a security system, comprising the steps of repeatedly performing an algorithm at one or more first locations to generate a series of n-times modified security codes obtained by operating with said algorithm n times beginning from a starting security code;
- transmitting a plurality of encoded signals to a second location, each of said encoded signals including said starting code and an n-times modified code;
performing said algorithm at said second location in response to arrival of each encoded signal to generate respective m-times modified security codes obtained by operating with said algorithm m times beginning from an initial security code;
comparing the starting code of each encoded signal arriving at said second location with said initial code and comparing the n-times modified code of the signal with the corresponding m-times modified code; and
generating a control signal for the performance of a security-related function when and only when the starting code of an encoded signal arriving at said second location is identical to said initial code and the n-times modified code of the signal is identical to the corresponding m-times modified code. - View Dependent Claims (19)
- transmitting a plurality of encoded signals to a second location, each of said encoded signals including said starting code and an n-times modified code;
Specification