Encryption and communication apparatus and method using modulated delay time feedback chaotic system
First Claim
1. An encryption apparatus using a modulated delay time feedback chaotic system, comprising:
- chaotic signal generating means for generating a high-dimensional chaotic signal in response to an original chaotic signal and a predetermined feedback chaotic signal;
delay time modulating means for delaying the high-dimensional chaotic signal output from the chaotic signal generating means by a predetermined time and modulating the time-delayed chaotic signal; and
feedback means for receiving the chaotic signal output from the chaotic signal generating means and the modulated time-delayed signal output from the delay time modulating means, performing addition and subtraction operations with respect to the received signals, and feeding the operated result back to the chaotic signal generating means.
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Abstract
Disclosed herein is an encryption and communication apparatus and method using a modulated delay time feedback chaotic system. The encryption apparatus of the present invention includes chaotic signal generating means for generating a high-dimensional chaotic signal in response to an original chaotic signal and a predetermined feedback chaotic signal, delay time modulating means for delaying the high-dimensional chaotic signal output from the chaotic signal generating means by a predetermined time and modulating the time-delayed chaotic signal, and feedback means for receiving the chaotic signal output from the chaotic signal generating means and the modulated time-delayed signal output from the delay time modulating means, performing addition and subtraction operations with respect to the received signals, and feeding the operated result back to the chaotic signal generating means. Accordingly, the present invention is advantageous in that it modulates a delay time so as to prevent an information signal contained in a chaotic signal from being attacked from the outside, so that it is impossible to detect an exact delay time contained in a modulated time-delayed chaotic signal and to decrypt the information signal, thus constructing a more robust and reliable encryption system.
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Citations
14 Claims
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1. An encryption apparatus using a modulated delay time feedback chaotic system, comprising:
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chaotic signal generating means for generating a high-dimensional chaotic signal in response to an original chaotic signal and a predetermined feedback chaotic signal;
delay time modulating means for delaying the high-dimensional chaotic signal output from the chaotic signal generating means by a predetermined time and modulating the time-delayed chaotic signal; and
feedback means for receiving the chaotic signal output from the chaotic signal generating means and the modulated time-delayed signal output from the delay time modulating means, performing addition and subtraction operations with respect to the received signals, and feeding the operated result back to the chaotic signal generating means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An encryption and communication apparatus using a modulated delay time feedback chaotic system, comprising:
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an encryption apparatus including first chaotic signal generating means for generating a high-dimensional chaotic signal in response to a predetermined feedback chaotic signal, delay time modulating means for delaying the chaotic signal output from the first chaotic signal generating means by a predetermined time and modulating the time-delayed chaotic signal to generate a high-dimensional encryption signal, feedback means for receiving the chaotic signal output from the first chaotic signal generating means and the modulated time-delayed chaotic signal output from the delay time modulating means, performing addition and subtraction operations with respect to the two received signals and feeding the operated result back to the first chaotic signal generating means, encryption means for receiving the high-dimensional encryption signal output from the delay time modulating means and an externally-applied information signal and adding the two signals to realize encryption, and transmitting means for transmitting a signal output from the encryption means as a wireless or wired signal; and
a decryption apparatus including an receiving means for receiving the encryption signal from the transmitting means of the encryption apparatus, second chaotic signal generating means for generating a high-dimensional chaotic signal in response to a predetermined feedback chaotic signal, feedback means for receiving the encryption signal output from the receiving means and the chaotic signal output from the second chaotic signal generating means, performing addition and subtraction operations with respect to the two received signals and feeding the operated result back to the second chaotic signal generating means, delay time modulating means for receiving the chaotic signal output from the second chaotic signal generating means and modulating a delay time of the chaotic signal, and decryption means for performing a subtraction operation on the modulated time-delayed signal output from the delay time modulating means and the encryption signal output from the receiving means to realize decryption. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An encryption and communication method using a modulated delay time feedback chaotic system, comprising the steps of:
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generating a chaotic signal by a chaotic system in which variables are functionally connected and a delay time is modulated;
encrypting an externally-applied information signal by adding the information signal to the chaotic signal, the delay time of which is modulated, thus generating an encryption signal;
transmitting the encryption signal;
receiving the encryption signal and feeding the encryption signal to a predetermined chaotic system;
receiving the chaotic signal output from the chaotic system and modulating a delay time of the chaotic signal; and
comparing the modulated time-delayed chaotic signal to the received encryption signal and then extracting the information signal, thus decrypting the encryption signal.
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Specification