23 research outputs found
Lazy Random Walk Efficient for Pollardâs Rho Methoï― Attacking on G3 over Barreto-Naehrig Curve (Corrected)
Pairingâbased cryptosystems are well implemented with Ateâtype pairing over BarretoâNaehrig (BN)
curve. Then, for instance, their securities depend on the difficulty of Discrete Logarithm Problem (DLP)
on the soâdenoted G3 over BN curve. This paper, in order to faster solve the DLP, first proposes to
utilize Gauss period Normal Basis (GNB) for Pollardâs rho method, and then considers to accelerate the
solving by an adoption of lazy random walk, namely tag tracing technique proposed by Cheon et al
āļāļēāļĢāđāļāļĢāļĩāļĒāļāđāļāļĩāļĒāļāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļāļāļāļāļļāļāļāđāļāļĄāļđāļĨāļāļĩāđāļĄāļĩāđāļĨāļāļāļĢāļ°āļāļģāļŦāļĨāļąāļāđāļāļĩāļĒāļ§āļāļąāļ āļāļąāđāļāđāļāđ 2 â 20 āļŦāļĨāļąāļāļāđāļ§āļĒ Pollardâs rho Algorithm āđāļĨāļ° Fermatâs Factorization Method
āļāļēāļāļ§āļīāļāļąāļĒāļāļĩāđāđāļāđāļāļģāđāļŠāļāļāļāļēāļĢāđāļāļĢāļĩāļĒāļāđāļāļĩāļĒāļāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļ āđāļāđāļāļāļēāļĢāļ§āļīāļāļąāļĒāđāļāļīāļāļāļāļĨāļāļāļāđāļ§āļĒāļ§āļīāļāļĩ Pollard's rho Algorithm āđāļĨāļ° Fermat's Factorization Method āļāļąāđāļāļŠāļāļāļāļąāļĨāļāļāļĢāļīāļāļķāļĄāļāļąāđāļāđāļāđāļāļāļąāļĨāļāļāļĢāļīāļāļķāļĄāļāļĩāđāđāļāđāļĢāļąāļāļāļ§āļēāļĄāļāļīāļĒāļĄāđāļāļāļąāļāļāļļāļāļąāļ āļŦāļēāļāđāļāļĢāļĩāļĒāļāđāļāļĩāļĒāļāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāđāļāļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļāļāļāļāļąāļ§āđāļĨāļāļāļąāđāļ§āđāļāđāļĨāđāļ§āļāļąāđāļāļāļąāđāļ 2 āļāļąāļĨāļāļāļĢāļīāļāļķāļĄ āļĄāļĩāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāđāļāļāļēāļĢāļāļģāļāļēāļāđāļāļāļāđāļēāļāļāļąāļ āđāļāļĒāļāļāļĨāļāļāļāđāļ§āļĒāļāļļāļāļāđāļāļĄāļđāļĨāļāļĩāđāļĄāļĩāļāđāļēāļāđāļāļĄāļđāļĨāđāļĨāļāļāļĢāļ°āļāļģāļŦāļĨāļąāļāđāļāļĩāļĒāļ§āļāļąāļāļāļąāđāļāļŦāļĄāļ āļāļąāļāļāļąāđāļāļāļķāļāļāļģāļāļąāļĨāļāļāļĢāļīāļāļķāļĄāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļāļąāđāļ 2 āđāļāļ āđāļāļĒāđāļāđāļāļļāļāļāđāļāļĄāļđāļĨāļāļąāļ§āđāļĨāļāļāļąāđāļāļŠāļīāđāļ 171 āļāļļāļ āļāļķāđāļāļāļĢāļ°āļāļāļāđāļāļāđāļ§āļĒāļāļąāļ§āđāļĨāļāļāļąāđāļāđāļāđ 2 āļŦāļĨāļąāļ āļāļāļāļķāļ 20 āļŦāļĨāļąāļ āđāļāļĒāļĄāļĩāđāļĨāļāļāļĢāļ°āļāļģāļŦāļĨāļąāļāđāļāļĩāļĒāļ§āļāļąāļ āđāļĢāļīāđāļĄāļāļąāđāļāđāļāđ 1-9 āđāļĨāļ°āđāļāļĢāļĩāļĒāļāđāļāļĩāļĒāļāļ§āđāļēāļāļąāđāļāļŠāļāļāļāļąāļĨāļāļāļĢāļīāļāļķāļĄāļāļąāđāļāđāļŦāđāļāļĨāļĨāļąāļāļāđāļāļāļāđāļ§āļĨāļēāđāļĨāļ°āļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāđāļāļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļāļēāļāļāļļāļāļāđāļāļĄāļđāļĨāđāļāđāļĨāļ°āļāļļāļ āđāļāļĒāļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļāļāļāļāļļāļāļāđāļāļĄāļđāļĨāļāļĩāđāļĄāļĩāđāļĨāļāļāļĢāļ°āļāļģāļŦāļĨāļąāļāđāļāļĩāļĒāļ§āļāļąāļāļāļąāđāļāļŦāļĄāļ āļāļāļ§āđāļē āļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļ§āļīāļāļĩ Pollard's rho Algorithm āļĄāļĩāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļāļāđāļēāļāļāļ§āļēāļĄāđāļĢāđāļ§āđāļāļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļāļāļĩāļāļ§āđāļēāļ§āļīāļāļĩ Fermat's Factorization MethodāļāļģāļŠāļģāļāļąāļ: āļāļēāļĢāđāļĒāļāļāļąāļ§āļāļĢāļ°āļāļāļ Â āļāļąāļĨāļāļāļĢāļīāļāļķāļĄāļāļāļĨāļĨāļēāļĢāđāļ āđāļĢÂ āļāļąāļĨāļāļāļĢāļīāļāļķāļĄāļāļĪāļĐāļāļĩāđāļāļĢāđāļĄāļēāļāđThis research showed the factorization to compare the results of the algorithm used to factorization. Experimental research using Pollard's rho algorithm and Fermat's factorization method, both algorithms are currently popular algorithms. Comparing the efficiency of factorization of common numbers, the two algorithms are not very different in their efficiency. Therefore, the two factorial algorithms are used, using 171 numerical data sets, consisting of 2 - 20 digits, with the same numerals from 1 to 9, and comparing the two algorithms. Comparing these two algorithms gives the results of the time and efficiency of the factorization from each set. The results show that the Pollard's rho algorithm is more efficient and faster than the Fermat's factorization method.Keywords: Factorization, Pollard's rho Algorithm, Fermat's Factorization Metho
Atac al problema del logaritme discret mitjançant la paral·lelitzaciÃģ de l'algorisme Rho de Pollard emprant la plataforma CoDiP2P
Aquest treball final de carrera tÃĐ com a objectiu l'estudi del problema del logaritme discret i les variants d'un dels possibles i millors atacs que existeixen fins ara: la Rho de Pollard. La implementaciÃģ d'aquest algorisme s'ha paral·lelitzat sobre un sistema de computaciÃģ distribuÃŊda peer-to-peer anomenat CoDiP2P. Centrant l'atenciÃģ en la seva aplicaciÃģ sobre el grup multiplicatiu F*p
Computing Discrete Logarithms in the Jacobian of High-Genus Hyperelliptic Curves over Even Characteristic Finite Fields
We describe improved versions of index-calculus algorithms for solving discrete logarithm problems in Jacobians of high-genus hyperelliptic curves defined over even characteristic fields. Our first improvement is to incorporate several ideas for the low-genus case by Gaudry and Theriault, including the large prime variant and using a smaller factor base, into the large-genus algorithm of Enge and Gaudry. We extend the analysis in [24] to our new algorithm, allowing us to predict accurately the number of random walk steps required to find all relations, and to select optimal degree bounds for the factor base. Our second improvement is the adaptation of sieving techniques from Flassenberg and Paulus, and Jacobson to our setting. The new algorithms are applied to concrete problem instances arising from the Weil descent attack methodology for solving the elliptic curve discrete logarithm problem, demonstrating significant improvements in practice
Quantum Algorithms for Attacking Hardness Assumptions in Classical and PostâQuantum Cryptography
In this survey, the authors review the main quantum algorithms for solving the computational problems that serve as hardness assumptions for cryptosystem. To this end, the authors consider both the currently most widely used classically secure cryptosystems, and the most promising candidates for post-quantum secure cryptosystems. The authors provide details on the cost of the quantum algorithms presented in this survey. The authors furthermore discuss ongoing research directions that can impact quantum cryptanalysis in the future
Design and Analysis of Cryptographic Hash Functions
WydziaÅ Matematyki i InformatykiKryptograficzne funkcje haszujÄ
ce stanowiÄ
element skÅadowy wielu algorytmÃģw kryptograficznych. PrzykÅadowymi zastosowaniami kryptograficznych funkcji haszujÄ
cych sÄ
podpisy
cyfrowe oraz kody uwierzytelniania wiadomoÅci. Ich wÅasnoÅci kryptograficzne majÄ
znaczÄ
cy wpÅyw na poziom bezpieczeÅstwa systemÃģw kryptograficznych wykorzystujÄ
cych haszowanie.
W dysertacji analizowane sÄ
kryptograficzne funkcje haszujÄ
ce oraz omÃģwione gÅÃģwne zasady tworzenia
bezpiecznych kryptograficznych funkcji haszujÄ
cych. Analizujemy bezpieczeÅstwo dedykowanych funkcji haszujÄ
cych (BMW, Shabal, SIMD, BLAKE2, Skein) oraz funkcji haszujÄ
cych zbudowanych z szyfrÃģw blokowych (Crypton, Hierocrypt-3, IDEA, SAFER++, Square). GÅÃģwnymi metodami kryptoanalizy uÅžytymi sÄ
skrÃģcona analiza rÃģÅžnicowa, analiza rotacyjna i przesuwna. Uzyskane wyniki pokazujÄ
sÅaboÅci analizowanych konstrukcji.Cryptographic Hash Functions (CHFs) are building blocks of many cryptographic algorithms. For instance, they are indispensable tools for efficient digital signature and authentication tags. Their security properties have tremendous impact on the security level of systems, which use cryptographic hashing.
This thesis analyzes CHFs and studies the design principles for construction of secure and efficient CHFs. The dissertation investigates security of both dedicated hash functions (BMW, Shabal, SIMD, BLAKE2, Skein) and hash functions based on block ciphers (Crypton, Hierocrypt-3, IDEA, SAFER++, Square). The main cryptographic tools applied are truncated differentials, rotational and
shift analysis. The findings show weaknesses in the designs
Theoretical and practical efficiency aspects in cryptography
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Weekly Kentucky New Era, February 9, 1894
U danaÅĄnje vrijeme informacijske tehnologije predstavljaju jednu od kljuÄnih generiÄkih tehnologija jer su usko vezane uz podruÄja gospodarstva, znanosti, druÅĄtvenoga i privatnoga Åūivota i u njih unose znaÄajne promjene mijenjajuÄi naÄine na koji ljudi rade i Åūive te ustroj i naÄin poslovanja suvremenih tvrtki. Informatika kao znanost o informacijama predstavlja vaÅūnu odrednicu suvremenog svijeta odlikovanog globalizacijom, a ICT sektor predstavlja vaÅūnu sastavnicu svakog pojedinog gospodarstva. Svrha i cilj ovog rada je, uz teorijske odrednice ICT sektora i njegove uloge u suvremenom gospodarstvu, dati uvid u detaljnu analizu ICT sektora Republike Hrvatske.Nowadays information technology is one of the key generic technologies because it is closely relate to the fields of economics, science, social and private life and bring significant changes to them by changing the ways in which people are working and living and in which modern companies operate. Information science represents an important determinant of the contemporary world characterized by globalization, and the ICT sector is an important component of each individual economy. Aside from presenting a theoretical background of the ICT sector and its role in modern economy, additional purpose of this paper is to provide an insight into the detailed analysis of the ICT sector of the Republic of Croatia