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Example, an encryption algorithm based on Chebyshev polynomials. The domain of the message must be in [-1,1] while the ASCII table is 0 – 255 how does it encrypt it?
Chebyshev polynomials: http://www.cecm.sfu.ca/CAG/papers/Cheb.pdf
Normalize your input from
0-255range to[-1,1]:N(x) = x/128 - 1and useN(x)as input to your encryption algorithm instead ofx. For other ranges just use different normalization function.