Cryptography

Download Advances in Elliptic Curve Cryptography (London Mathematical by Ian F. Blake, Gadiel Seroussi, Nigel P. Smart PDF

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By Ian F. Blake, Gadiel Seroussi, Nigel P. Smart

Because the visual appeal of the authors' first quantity on elliptic curve cryptography in 1999 there was super growth within the box. In a few themes, rather aspect counting, the growth has been staggering. different themes resembling the Weil and Tate pairings were utilized in new and critical how you can cryptographic protocols that carry nice promise. Notions reminiscent of provable defense, part channel research and the Weil descent method have additionally grown in significance. This moment quantity addresses those advances and brings the reader brand new. admired members to the study literature in those parts have supplied articles that replicate the present nation of those vital themes. they're divided into the parts of protocols, implementation recommendations, mathematical foundations and pairing dependent cryptography. all the themes is gifted in an obtainable, coherent and constant demeanour for a large viewers that would comprise mathematicians, computing device scientists and engineers.

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Background. 2], [IEEE 1363], [ISO 15946-2], [NESSIE] and [RFC 3278]. Organizations chose ECDSA because they regarded its reputational security sufficient, on the grounds that (a) it is a very natural elliptic curve analogue of DSA, and that (b) both elliptic curve cryptography and DSA were deemed to have sufficiently high reputational security. The standardization of ECDSA has created more intense public scrutiny. Despite this, no substantial weaknesses in ECDSA have been found, and thus its reputational security has increased.

OUTPUT: A ciphertext C 1. Parse K as k1 k2 , where k1 has m bits and k2 has n bits. 2. c ← Ek1 (M ). 3. r ← M ACk2 (c). 4. C ← (c r). 9: DEM Decryption INPUT: A key K of length n + m bits and a ciphertext C. OUTPUT: A message M or ‘‘Invalid Ciphertext’’. 1. Parse K as k1 k2 , where k1 has m bits and k2 has n bits. 2. Parse C as c r, this could result in an ‘‘Invalid Ciphertext’’ warning. 3. Decrypt the message M ← Dk1 (c). 4. If r = M ACk2 (c) then output ‘‘Invalid Ciphertext’’. 5. Output M . To use a DEM we require a KEM, and we shall focus on one based on ECIES called ECIES-KEM.

It can lead to other kind of attacks, as outlined below, because clustering at certain values can lead to weakened secondpreimage resistance of the hash function. Zero-Resistant Hash : A zero finder of a hash function is a probabilistic algorithm that finds a message m such that H(m) = 0. A hash function is zero-resistant if no zero finder exists. A passive existential forger can be constructed from a zero finder in a similar manner to above. The forger chooses signature (r, s) = (f ([t]Y ), t−1 r) and, using the zero finder, finds a message m such that H(m) = 0.

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