System and method for data transmission over arbitrary media using physical encryption
First Claim
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1. A system for data transmission using a quantum encrypted signal, comprising:
- an optical transmitter transmitting the quantum encrypted signal;
the signal is phase modulated according to an M-ary phase modulated format where the phase applied is determined by both a pseudo-random cryptographic algorithm working as a first extended key generator and the data to be transmitted;
a number of data bits transmitted per symbol is N, wherein N<
M;
a receiver which measures an incoming transmitted signal by making measurements at two or more different phase quadratures, digitizes the measurement using analog-to-digital converters, and estimates the phase applied at the transmitter using a digital signal processor (DSP).
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Abstract
Apparatus and method for a secure communication network using AlphaEta quantum encryption is provided. A polarization insensitive optical receiver based on a 90 degrees hybrid coupler is used for the detection and digitization of optically encrypted signals. Once digitized, such signals can be decrypted, stored, or re-transmitted over arbitrary media such as using RF wireless means. Alternatively, the signal can be generated directly for transmission over RF wireless nodes. The system may include nodes for retransmitting the signal without decrypting it, allowing for secure communication among specific users.
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Citations
34 Claims
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1. A system for data transmission using a quantum encrypted signal, comprising:
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an optical transmitter transmitting the quantum encrypted signal;
the signal is phase modulated according to an M-ary phase modulated format where the phase applied is determined by both a pseudo-random cryptographic algorithm working as a first extended key generator and the data to be transmitted;a number of data bits transmitted per symbol is N, wherein N<
M;a receiver which measures an incoming transmitted signal by making measurements at two or more different phase quadratures, digitizes the measurement using analog-to-digital converters, and estimates the phase applied at the transmitter using a digital signal processor (DSP). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for multiple-channel signal transmission, comprising:
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a plurality of optical differential phase-modulated signal transmitters of different wavelengths;
wherein each channel'"'"'s phase modulation can be either traditional or quantum encrypted,a receiver having a single asymmetric I/Q demodulator for detecting the differential phase of the signals;
wherein an in-phase I and a quadrature Q outputs are followed by a wavelength division multiplexer to separate each channels I and Q signals;a series of photodetectors measuring each I/Q signal followed by analog-to-digital converters digitizing the signal, a DSP unambiguously determining the differential phase and subsequently the data applied to each channel. - View Dependent Claims (12, 13, 14)
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15. A system for data transmitting using an encrypted signal, comprising:
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a transmitter transmitting the encrypted signal wherein the encrypted signal has an M-ary format and the data is an N-ary format with N<
M, the M-ary symbol is chosen based on the output of a pseudo-random cryptographic algorithm working as an extended key generator and the data to be transmitted;at least a first node which receives, measures and retransmits the received encrypted signal; and a receiver which measures the incoming encrypted signal and decrypts it using a cryptographic algorithm. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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- 25. A system of data transmission using an encrypted signal, wherein an AlphaEta-style encryption is implemented in a radio-frequency communications and a local noise source generates noise which is added to an M'"'"'ary transmission symbol, where the M'"'"'ary symbol is determined both from a pseudo-random cryptographic algorithm and the data to be transmitted, and wherein the M'"'"'ary symbol contains N bits of information on the data, and where N<
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29. A method for data transmission of quantum encrypted signals, comprising:
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sending at least a first quantum encrypted signal;
the signal is phase modulated according to an M-ary phase modulated format where the phase applied is determined by both a pseudo-random cryptographic algorithm working as a first extended key generator and the data to be transmitted;
a number of data bits transmitted per symbol is N1, wherein N1<
M;receiving the first transmitted signal by a receiver having a delay line corresponding to the symbol duration, measuring two or more different phase quadratures, digitizing measured signals, and estimating the phase using a digital signal processing, and recovering information from the transmitted data. - View Dependent Claims (30, 31, 32, 33)
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34. A method of data transmission using an encrypted signal, comprising:
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sending a radio-frequency signal using an AlphaEta-style encryption;
the signal uses an orthogonal frequency division modulation format and a plurality of sub-carriers are transformed into an M'"'"'ary symbol by an encryption process;generating a local noise signal and adding it to the M'"'"'ary transmission symbol, where the M'"'"'ary symbol is determined both from a pseudo-random cryptographic algorithm and the data to be transmitted, and wherein the M'"'"'ary symbol contains N bits of information on the data, and where N<
M;receiving the transmitted encrypted signal, decrypting the signal by transforming the plurality of sub-carriers from M'"'"'ary to N'"'"'ary using the output of a matched pseudo-random cryptographic algorithm, and recovering data.
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Specification