Results 181 to 190 of about 1,704 (217)

Hardware attacks: an algebraic approach

Journal of Cryptographic Engineering, 2016
Many VLSI chips now contain cryptographic processors to secure their data and external communications. Attackers target the hardware to imitate or understand the system design, to gain access to the system or to obtain encryption keys. They may also try to initiate attacks such as denial of service to disable the services supported by a chip, or reduce
Samer Moein, Fayez Gebali, T. Aaron Gulliver   +2 more
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A New Variant of Algebraic Attack

2014
Algebraic attack is an important attack strategy against symmetric ciphers, particularly stream ciphers. The most vital issue in this attack is to reduce the degree of the algebraic equations as much as possible in order to obtain a lower time complexity.
Dibyendu Roy 0001, Pratish Datta, Sourav Mukhopadhyay   +2 more
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Algebraic Attack on HFE Revisited

2008
In this paper, we study how the algebraic attack on the HFE multivariate public key cryptosystem works if we build an HFE cryptosystem on a finite field whose characteristic is not two. Using some very basic algebraic geometry we argue that when the characteristic is not two the algebraic attack should not be polynomial in the range of the parameters ...
Jintai Ding, Dieter Schmidt, Fabian Werner   +2 more
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Simplifying algebraic attacks with univariate analysis

2011 Information Theory and Applications Workshop, 2011
The purpose of this paper is to present a more fine-grained view on cryptanalysis of stream ciphers based on LFSRs in terms of the univariate representation and to provide some connections to cyclic codes. A usual way of presenting such ciphers is in terms of multivariate equations over GF(2).
Tor Helleseth, Sondre Rønjom
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Algebraic Attacks on Round-Reduced Keccak

2021
Since Keccak was selected as the SHA-3 standard, both its hash mode and keyed mode have attracted lots of third-party cryptanalysis. Especially in recent years, there is progress in analyzing the collision resistance and preimage resistance of round-reduced Keccak.
Fukang Liu, Takanori Isobe 0001, Willi Meier, Zhonghao Yang 0003   +3 more
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An Algebraic Broadcast Attack against NTRU

2012
In this paper, we propose an algebraic broadcast attack against NTRU, which recovers a single message encrypted multiple times using different NTRU public keys. Namely, when a message is broadcasted, under some reasonable assumptions, our attack can be completed in polynomial time and space.
Jintai Ding, Yanbin Pan, Yingpu Deng
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Meeting the Attacks on Algebra

The Mathematics Teacher, 1926
No subject in the high school curriculum, according to some educators, has yielded such unsatisfactory results as Algebra. It has been the subject of most severe criticisms on all sides, and has been held responsible for a great deal of freshman mortality. A leading educator of Massachusetts, in one of his public speeches, has expressed the desire that
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Algebraic Attack to SMS4 and the Comparison with AES

2009 Fifth International Conference on Information Assurance and Security, 2009
SMS4 is a 128-bit block cipher, which is used in the WAPI standard in China. This paper examines algebraic attacks on SMS4 over two different fields, that is, GF(2) and GF$(2^8),$ respectively. With regards to this, we first describe the SMS4 as systems of quadratic equations over the two different fields, and then estimate the computational ...
Wen Ji, Lei Hu, Haiwen Ou
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An Improvement of Linearization-Based Algebraic Attacks

2011
In an algebraic attack on a cipher, one expresses the encryption function as a system (usually overdefined) of multivariate polynomial equations in the bits of the plaintext, the ciphertext and the key, and subsequently solves the system for the unknown key bits from the knowledge of one or more plaintext/ciphertext pairs.
Satrajit Ghosh, Abhijit Das 0004
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Algebraic Attacks on the Courtois Toy Cipher

Cryptologia, 2008
This article presents and discusses some of the most important algebraic attack algorithms (F4, DR, XL) and employs them against Courtois' toy cipher (CTC). Also, CTC is attacked using more specialized algorithms and the experimental results of these attacks are presented.
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