Get A Classical Introduction to Cryptography: Applications for PDF

By Serge Vaudenay

ISBN-10: 0387254641

ISBN-13: 9780387254647

ISBN-10: 0387258809

ISBN-13: 9780387258805

A Classical advent to Cryptography: functions for Communications Security introduces basics of knowledge and verbal exchange safety by way of supplying acceptable mathematical options to end up or holiday the safety of cryptographic schemes.

This advanced-level textbook covers traditional cryptographic primitives and cryptanalysis of those primitives; uncomplicated algebra and quantity conception for cryptologists; public key cryptography and cryptanalysis of those schemes; and different cryptographic protocols, e.g. mystery sharing, zero-knowledge proofs and indisputable signature schemes.

A Classical creation to Cryptography: purposes for Communications safety is wealthy with algorithms, together with exhaustive seek with time/memory tradeoffs; proofs, corresponding to safety proofs for DSA-like signature schemes; and classical assaults reminiscent of collision assaults on MD4. Hard-to-find criteria, e.g. SSH2 and safety in Bluetooth, also are included.

A Classical advent to Cryptography: purposes for Communications Security is designed for upper-level undergraduate and graduate-level scholars in laptop technological know-how. This ebook is usually compatible for researchers and practitioners in undefined. A separate exercise/solution e-book is accessible in addition, please visit www.springeronline.com lower than writer: Vaudenay for added info on tips on how to buy this booklet.

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H (X |Y ) = − Pr[X = x, Y = y] log2 Pr[X = x|Y = y]. 1. For any distribution, we have r H (X, Y ) ≥ H (X ) with equality if and only if Y can be written f (X ) r H (X, Y ) ≤ H (X ) + H (Y ) with equality if and only if X and Y are independent; 17 For more information, see the textbook by Cover and Thomas (Ref. [52]). 18 Chapter 1 r if Pr[X = x] = 0 for at least n values of x then H (X ) ≤ log n with equality if 2 and only if all nonzero Pr[X = x] are equal to n1 . 3 Perfect Secrecy Perfect secrecy means that the a posteriori distribution of the plaintext X after we know the ciphertext Y is equal to the a priori distribution of the plaintext: the conditional distribution of X given Y is equal to the original distribution.

For this reason we must insert (at least) a permutation σ as depicted in Fig. 1 for the FOX algorithms. When the permutation σ is such that z → σ (z) − z is also a permutation, we say that σ is an orthomorphism for the + law. We can demonstrate that when σ is an orthomorphism, then the Lai–Massey scheme provides security properties which are similar to those for the Feistel scheme. So the invariance of the basic Lai–Massey scheme is no longer a problem. In IDEA, key-dependent permutations (namely, products and additions) are used instead of a fixed σ .

IDEA was published in Lai’s thesis (Ref. [110]) in 1992. 5 Like DES, IDEA is a block cipher for 64-bit blocks. IDEA uses much longer keys than DES as it allows for 128-bit keys. In the same way that DES was dedicated to hardware, IDEA was dedicated to software implementation on 16-bit microprocessors (which used to be a luxurious architecture in the early nineties). It makes an extensive use of the XOR, the addition modulo 216 , and the product of nonzero residues modulo 216 + 1. IDEA uses a structure similar to the Feistel scheme which can be called the Lai–Massey scheme.

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A Classical Introduction to Cryptography: Applications for Communications Security by Serge Vaudenay


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