(Ebook) Elementary cryptanalysis by Sinkov, Abraham ISBN 9780883856475, 9780883859377, 0883856476, 0883859378

(Ebook) Elementary cryptanalysis by Sinkov, Abraham ISBN 9780883856475, 9780883859377, 0883856476, 0883859378

Pt. 1. Monoalphabetic ciphers using additive alphabets. The Caesar cipher -- Modular arithmetic -- Additive alphabets -- Solution of additive alphabets -- Frequency considerations -- Multiplications -- Solution of multiplicative alphabets -- Affine ciphers -- Pt. 2. General monoalphabetic substitution . Mixed alphabets -- Solution of mixed alphabet ciphers -- Solution of five-letter groupings -- Monoalphabets with symbols -- Pt. 3. Polyalphabetic substitution. Polyalphabetic ciphers -- Recognition of polyalphabetic ciphers -- Determination of number of alphabets -- Solutions of additive subalphabets -- Mixed plain sequences -- Matching alphabets -- Reduction to a monoalphabet -- Mixed cipher sequences -- General comments;Pt. 4. Polygraphic systems. Linear transformations -- Multiplication of matrices -- inverses -- Involutory transformations -- Recognition of digraphic ciphers -- Solution of a linear transformation -- How to make the Hill system more secure -- Pt. 5. Transposition. Columnar transposition -- Completely filled rectangles -- Incompletely filled rectangles -- Probable word method -- General case -- Identical length messages -- Pt. 6. RSA encryption. Public-key encryption -- The RSA method -- Creating the RSA keys -- Why RSA works -- Fermat's Little Theorem -- Computational considerations -- Maple and Mathematica for RSA -- Breaking RSA and signatures -- Pt. 7. Perfect security. One-time pads -- Pseudo-random number generators;In this introduction, Professor Sinkov explains some of the fundamental techniques at the basis of cryptanalytic endeavour from which much more sophisticated techniques have evolved, especially since the advent of computers.