Download e-book for iPad: Algebra for Applications: Cryptography, Secret Sharing, by Arkadii Slinko

By Arkadii Slinko

ISBN-10: 3319219502

ISBN-13: 9783319219509

This booklet examines the connection among arithmetic and information within the glossy global. certainly, smooth societies are awash with information which needs to be manipulated in lots of alternative ways: encrypted, compressed, shared among clients in a prescribed demeanour, shielded from an unauthorised entry and transmitted over unreliable channels. All of those operations might be understood purely by way of somebody with wisdom of fundamentals in algebra and quantity theory.

This publication offers the mandatory heritage in mathematics, polynomials, teams, fields and elliptic curves that's enough to appreciate such real-life functions as cryptography, mystery sharing, error-correcting, fingerprinting and compression of data. it's the first to hide many fresh advancements in those themes. in keeping with a lecture direction given to third-year undergraduates, it really is self-contained with quite a few labored examples and workouts supplied to check figuring out. it may well also be used for self-study.

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Additional info for Algebra for Applications: Cryptography, Secret Sharing, Error-Correcting, Fingerprinting, Compression

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The theorem is proved. 4 Find the smallest positive integer N such that 5 = N mod 991, 8 = N mod 441. Using the Extended Euclidean algorithm we find 991 1 0 441 0 1 109 1 −2 5 −4 9 4 85 −191 1 −89 200 2 4 21 1 4 thus yielding 1 = (−89) · 991 + 200 · 441. We may write 8 − 5 = 3 = (−267) · 991 + 600 · 441 and obtain the number N = −264592 = 8 − 600 · 441 = 5 + (−267) · 991, which satisfies all the requirements apart from being between 0 and 437031 = 991 · 441. We divide N by 437031 with remainder.

30 1 Integers Proof Suppose that we have two inverses of a, say b and c, so that a and a c = c a = 1. Then b (a c) = b 1 = b, c=1 c = c, b=b a=1 and (b a) hence b = c due to the associative law of multiplication. If a multiplicative inverse of a exists, it is denoted a −1 . 3 All elements from Z∗n are invertible in Zn . Proof Let a ∈ Z∗n . Then gcd(a, n) = 1, and we can write a linear presentation of this greatest common divisor 1 = ua + vn. Let us divide u by n with remainder w. We have u = qn + w, where 0 ≤ w < n, and we substitute qn + w in place of u: 1 = (qn + w)a + vn = wa + (qa + v)n.

Under this 5 Velemir Khlebnikov (1885–1922) was one of the key poets in the Russian Futurist movement but his work and influence stretch far beyond it. He was educated as a mathematician and his poetry is very abstract and mathematical. He experimented with the Russian language, drawing deeply upon its roots. 42 2 Cryptology system a number in Z26 is assigned to every letter of the alphabet as in the previous section. Each letter is encoded into the corresponding number x it is assigned to and then into the letter to which the number a x ⊕ b is assigned.

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Algebra for Applications: Cryptography, Secret Sharing, Error-Correcting, Fingerprinting, Compression by Arkadii Slinko

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