Enhanced encryption method and system for ultra secure applications
AssigneeNucrypt LLC
InventorGregory S. Kanter
Life of this patent
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Abstract
Techniques to bolster the security of an AlphaEta cryptosystem using spectral phase encoding. In one aspect, a spatial light modulator (SLM) is used to change the spectral code (spectral phase) of each optical bit in response to the output of an extended key generator based on a cryptographic algorithm. In other aspects, additional time and polarization modulations are used to maintain high security levels as well as good performance levels. Such methods are combined with traditional key generation methods such as key-distribution centers or one-way mathematical algorithms to bolster the security of traditional key generation as well.
Claims38
A method for transmitting an encrypted optical signal over a communication link, comprising:
- applying a first phase shift to a signal, the first phase shift according to a combination of an M-ary temporal phase mask based on an output of a first pseudorandom generator and a data to be transmitted;
- applying a second M′-ary phase shift to the signal based on output of a second pseudorandom generator;
- transmitting the signal over the communication link;
- receiving the signal, the signal thus having reduced signal-to-noise ratio for a potential eavesdropper;
- and
- wherein the second phase shift is according to a fast M′-ary temporal phase mask which changes faster than the M-ary temporal mask and where M′<M.
An apparatus for signal encryption, comprising:
- a laser to generate an optical spectrum for creating a plurality of frequency bins available for modulation;
- a first extended key generator (EKG) to produce a pseudorandom output to determine a phase shift for initial encryption;
- a rate translator to group the output of the EKG into (a) a fast binary output normalized to provide a first 0 or π phase shift, and (b) a slower M-ary phase shift output from 0 to π;
- an encoder to combine the M-ary phase shift output with a set of encoded data bits according to an AlphaEta protocol, thereby creating a second phase shift varying quasi-continuously from 0 to 2 π;
- and
- a phase modulator;
- wherein the first and second phase shifts are combined_to drive the phase modulator and encrypt the optical field, producing an encrypted signal.
Dependencies are inferred from the claim text.