By Gregory Bard

ISBN-10: 0387887563

ISBN-13: 9780387887562

ISBN-10: 0387887571

ISBN-13: 9780387887579

Algebraic Cryptanalysis bridges the space among a path in cryptography, and with the ability to learn the cryptanalytic literature. This booklet is split into 3 elements: half One covers the method of turning a cipher right into a approach of equations; half covers finite box linear algebra; half 3 covers the answer of Polynomial platforms of Equations, with a survey of the tools utilized in perform, together with SAT-solvers and the equipment of Nicolas Courtois.

The cipher Keeloq, utilized in approximately all autos with distant key-less access, is defined as a operating instance, together with the manipulation of the equations to let their resolution. The flow cipher Trivium, besides its variations Bivium-A and Bivium-B, and the flow cipher relations QUAD also are analyzed as broad examples, together with summaries of a number of released attacks.

Additional themes include:

Analytic Combinatorics, and its program to cryptanalysis

The equicomplexity of linear algebra operations

Graph coloring

Factoring integers through the quadratic sieve, with its purposes to the cryptanalysis of RSA

Algebraic Cryptanalysis is designed for advanced-level scholars in computing device technology and arithmetic as a secondary textual content or reference ebook for self-guided learn. This e-book is especially appropriate for researchers in utilized summary Algebra or Algebraic Geometry who desire to locate extra utilized themes, practitioners operating for defense and communications businesses, or intelligence agencies.

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Extra resources for Algebraic Cryptanalysis

Example text

2 Ordinary and Exponential Generating Functions Given a set of constants indexed by Z≥0 , say c0 , c1 , c2 , . , the ordinary generating function (or OGF) is defined as the formal power series: de f C (z) = ∞ ∑ ci zi = c0 + c1 z + c2 z2 + c3 z3 + · · · . 2 Background 31 de f Ce (z) = ∞ ci c1 c2 c3 ∑ i! zi = c0 + 1! z + 2! z2 + 3! z3 + · · · . i=0 and as you can see, the EGF is just the OGF term-wise divided by i!. Sometimes the infinite sum that is presented is actually the Taylor Series of a well-known elementary function.

Cryptanalysis is only one of several applications, and we briefly mention some other applications. The concept of a universal map is also introduced. Namely, we prove that any map from any finite set to any finite set can be considered as a polynomial system of equations. After that follows a discussion of the properties of these polynomials. Next, we prove several theorems relating to the fact that any polynomial system of equations can be written with degree 2, via the introduction of new variables.

Since the NLF is actually a cubic function this is a cubic system of equations. Substituting, we obtain 14 2 The Block Cipher Keeloq and Algebraic Attacks Li = Pi ∀i ∈ [0, 31] Li = ki−32 mod 64 + Li−32 + Li−16 + Li−23 + Li−30 +Li−1 Li−12 + Li−1 Li−30 + Li−6 Li−12 + Li−6 Li−30 ∀i ∈ [32, 559] +Li−12 Li−23 + Li−23 Li−30 + Li−1 Li−23 Li−30 +Li−1 Li−12 Li−30 + Li−1 Li−6 Li−23 + Li−1 Li−6 Li−12 Ci−528 = Li ∀i ∈ [528, 559] In other words, the above equations are to be repeated for each i in the stated intervals, and for each of µ total plaintext-ciphertext message pairs.

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