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The Chirp Function Revisited: A Uniqueness Conjecture For Chirplet Modulation, Jonathan Blackledge, Paul Tobin
The Chirp Function Revisited: A Uniqueness Conjecture For Chirplet Modulation, Jonathan Blackledge, Paul Tobin
Conference papers
The chirp function (a unit amplitude quadratic phase-only function with linear frequency modulation) is well known and is used in a wide range of applications including radar, digital communications, information coding and hiding and many other forms of signal and image processing. This is because the chirp provides an optimal solution to the problem of retrieving information from low energy signals with a low Signal-to-Noise Ratio (SNR). The chirp function also occurs in the solution to many mathematical models used to describe the propagation and scattering of waves (in the Fresnel zone), in quantum mechanics (the quantum shutter problem) and …
Phase-Only Digital Encryption Using A Three-Pass Protocol, Jonathan Blackledge, Paul Tobin, W. Govere, S. Sibanda, C. M. Adolfo
Phase-Only Digital Encryption Using A Three-Pass Protocol, Jonathan Blackledge, Paul Tobin, W. Govere, S. Sibanda, C. M. Adolfo
Conference papers
Abstract—This paper considers an application of phase-only digital encryption to the three-pass protocol leading to a new ‘nokey- exchange algorithm’. After providing a study on the theoretical background to the method, an algorithm is presented on a step-by-step basis together with three examples of cryptanalysis. A prototype MATLAB function is provided for validation of the approach and for further development by interested readers.