Download Algebraic Geometry in Coding Theory and Cryptography by Harald Niederreiter PDF

By Harald Niederreiter

This textbook equips graduate scholars and complex undergraduates with the required theoretical instruments for making use of algebraic geometry to details thought, and it covers fundamental purposes in coding thought and cryptography. Harald Niederreiter and Chaoping Xing give you the first certain dialogue of the interaction among nonsingular projective curves and algebraic functionality fields over finite fields. This interaction is prime to investigate within the box at the present time, but in the past no different textbook has featured entire proofs of it. Niederreiter and Xing conceal classical functions like algebraic-geometry codes and elliptic-curve cryptosystems in addition to fabric no longer taken care of through different books, together with function-field codes, electronic nets, code-based public-key cryptosystems, and frameproof codes. Combining a scientific improvement of idea with a large collection of real-world functions, this is often the main complete but obtainable advent to the sphere available.Introduces graduate scholars and complicated undergraduates to the principles of algebraic geometry for purposes to details idea presents the 1st exact dialogue of the interaction among projective curves and algebraic functionality fields over finite fields comprises purposes to coding concept and cryptography Covers the most recent advances in algebraic-geometry codes good points functions to cryptography no longer taken care of in different books

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Additional resources for Algebraic Geometry in Coding Theory and Cryptography

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If P1 and P2 are two distinct places of F /k, then there exists an element z ∈ F such that νP1 (z) > 0 and νP2 (z) ≤ 0. 22 CHAPTER 1 Proof. First consider any u ∈ F with νP2 (u) = 0. If νP1 (u) = 0, then either z = u or z = u−1 works. Thus, we are left with the case where νP2 (u) = 0 always implies νP1 (u) = 0. Let y ∈ F ∗ be arbitrary and let t ∈ F be a local parameter at P2 . Then we can write y = t n u with n ∈ Z and νP2 (u) = 0. It follows that νP1 (u) = 0, and so νP1 (y) = nνP1 (t). Since νP1 is normalized, we must have νP1 (t) = ±1.

2. 8. An affine (respectively projective) algebraic set V is an affine (respectively projective) variety if and only if I (V ) is a prime ideal of k[X]. Proof. We first prove the result for the affine case. Assume that I (V ) is a prime ideal of k[X]. Then I (V ) = k[X], and so V is nonempty. Suppose that V is reducible, that is, there exist two proper closed subsets V1 and V2 such that V = V1 ∪ V2 . 8(ii), we can choose fj ∈ I (Vj ) \ I (V ) for j = 1, 2. Then f1 f2 ∈ I (V ) by the definition of I (V ).

If I is the ideal of k[X] generated by S, then V = Z(I ). By the Hilbert basis theorem, I is generated by a finite subset T of k[X], and so V = Z(T ). 6(ii). It follows from the definitions that V ⊆ Z(I (V )). (iii) Again by the Hilbert basis theorem, I is generated by a finite subset T of k[X]. If f ∈ I (V ) = I (Z(T )), then the Hilbert Nullstellensatz shows that f r ∈ I for some integer r ≥ 1. Conversely, if f ∈ k[X] is such that f r ∈ I for some integer r ≥ 1, then f r (P ) = 0 for all P ∈ V ; hence, f (P ) = 0 for all P ∈ V , and so f ∈ I (V ).

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