Arkadii Slinko's Algebra for Applications: Cryptography, Secret Sharing, PDF

By Arkadii Slinko

ISBN-10: 3319219502

ISBN-13: 9783319219509

This booklet examines the connection among arithmetic and information within the sleek global. certainly, sleek societies are awash with facts which has to be manipulated in lots of other ways: encrypted, compressed, shared among clients in a prescribed demeanour, shielded from an unauthorised entry and transmitted over unreliable channels. All of those operations could be understood in basic terms via anyone with wisdom of fundamentals in algebra and quantity theory.

This e-book offers the required history in mathematics, polynomials, teams, fields and elliptic curves that's adequate to appreciate such real-life purposes as cryptography, mystery sharing, error-correcting, fingerprinting and compression of data. it's the first to hide many contemporary advancements in those issues. according to a lecture direction given to third-year undergraduates, it truly is self-contained with quite a few labored examples and workouts supplied to check figuring out. it might also be used for self-study.

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

Sample text

1 An algebraic system < G, + > which consists of a set G together with an algebraic operation + defined on it is said to be a commutative group if the following axioms are satisfied: CG1 CG2 CG3 CG4 The operation is commutative, a + b = b + a, for all a, b ∈ G. The operation is associative, a + (b + c) = (a + b) + c, for all a, b, c ∈ G. There exists a unique element 0 such that a + 0 = 0 + a = a, for all a ∈ G. For every element a ∈ G there exists a unique element −a such that a + (−a) = (−a) + a = 0, for all a ∈ G.

The invertibility of K is needed for the unambiguous recovery of x1 , x2 from y1 , y2 . 1 Let K= 33 25 and suppose the plaintext message is HELP. Then this plaintext is represented by two pairs HELP → 11 7 L H . , → , 15 4 P E Then we compute 33 25 7 7 = , 4 8 33 25 11 0 = 15 19 and continue the encryption as follows: 7 0 H A , → , → HIAT 8 19 I T so the cryptotext is HIAT. The matrix K is invertible, hence an inverse K −1 exists such that KK −1 = −1 K K = I2 , where I2 is the identity matrix of order 2.

By the Chinese Remainder Theorem there exists a unique positive integer Ni j such that 0 ≤ Ni j < mn and s j = Ni j mod n, ri = Ni j mod m, that is, Ni j has remainder ri on dividing by m, and remainder s j on dividing by n, so Ni j = am + ri , Ni j = bn + s j . 3 Fermat’s Little Theorem and Its Generalisations 23 We have gcd(Ni j , m) = gcd(m, ri ) = 1 and gcd(Ni j , n) = gcd(n, s j ) = 1, that is Ni j is relatively prime to m and also relatively prime to n. , Ni j ∈ Z∗mn . Clearly, different pairs (i, j) = (k, l) yield different numbers, that is Ni j = Nkl for (i, j) = (k, l).

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

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