Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Cryptanalysis"”.
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Cryptanalysis by Algebraic Relations
… the application of algebraic relations to cryptanalysis, presenting novel insights and algorithms. As a first result, we will show a simple theorem that guarantees the existence of algebraic relations of sublinear degree for overdetermined polynomial equation systems. Equipped with …
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Design Methods for Cryptanalysis
… the secret key using public information. Cryptanalysis, including logical and implementation attacks, plays an important role in allowing the security community to estimate their cost, based on the computational resources of an attacker. Practical implementations of cryptanalytic systems …
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Cryptanalysis of Selected Stream Ciphers
The aim of this dissertation is to show some cryptanalytical results on a selection of stream ciphers. We have grouped theory and results into three main parts. The first part focuses on the FCSR-based constructions X-FCSR and F-FCSR-H v3. For the X-FCSR family of stream ciphers we perform a severe …
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Automatic differential cryptanalysis of symmetric ciphers
L'abstract è presente nell'allegato / the abstract is in the attachment
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Algebraic and Logic Solving Methods for Cryptanalysis
… first sight. In fact, many problems coming from cryptanalysis, such as algebraic fault attacks, can be rephrased as solving a set of Boolean polynomials or as deciding the satisfiability of a propositional logic formula. Thus one can analyze the security of cryptosystems by applying standard …
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Neural Cryptanalysis for Cyber-Physical System Ciphers
… the work of the recently-developed neural cryptanalysis method, which trains neural networks on a set of plaintext/ciphertext pairs to extract meaningful bitwise relationships and predict corresponding ciphertexts given a set of plaintexts. As opposed to traditional cryptanalysis, the goal …
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Code-Based Digital Signature Schemes: Construction, Cryptanalysis and Theoretical Foundations
In recent decades, numerous code-based digital signature schemes following the hash&sign paradigm have been proposed, often turning out to be insecure and demonstrating that the cryptographic community still seems far from a satisfactory solution in this area. The first major question we pose in …
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STRENGTH EVALUATION OF CRYPTOGRAPHIC PRIMITIVES TO LINEAR, DIFFERENTIAL AND ALGEBRAIC ATTACKS.
Cryptanalysis is an effective method for ensuring the security of cryptographic primitives by attacking them with the most advanced techniques. This thesis provides a deep investigation of three different kinds of cryptanalysis for symmetric ciphers, differential, linear and algebraic, applying …
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Differential attacks using alternative operations and block cipher design
… part it is described the impact of differential cryptanalysis, a powerful statistical attack against block ciphers, when operations different from the one used to perform the key addition are considered on the message space. It is proven that when an alternative difference operation is carefully …
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Public key cryptography and the zero-one knapsack problem
… and polyalphabetic. Their susceptibility to cryptanalysis is examined. Asymmetric cryptosystems are introduced through public key cryptography. The Rivest-Shamir-Adelman cryptosystem is explained. Then the Merkle-Hellman system based on the zero-one knapsack problem is presented. Standard …
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SAT Solving Using XOR-OR-AND Normal Forms and Cryptographic Fault Attacks
… with XOR-rich instances arising frequently in cryptanalysis, due to the inefficiency of CNF encodings of linear constraints. Conversely, algebraic approaches can work with linear XOR constraints naturally but fail to scale to relevant sizes. Bridging these complementary paradigms with a focus …
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Vulnerabililty Analysis of Multi-Factor Authentication Protocols
… this hypothesis: 1. A generalized algorithm for cryptanalysis was formulated to perform a clogging attack (a formof denial of service) on protocols that use computationally intensive modular exponentiation to guarantee security. 2. This technique was then applied to cryptanalyze four recent …
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Binární znaménkové reprezentace celých čísel v kryptoanalýze hashovacích funkcí
… Signed Digit Representations of Integers in Cryptanalysis of Hash Functions Author: Jiří Vábek Department: Department of Algebra Supervisor: doc. RNDr. Jiří Tůma, DrSc., Department of Algebra Abstract: The work summarizes two main papers, A New Type of 2-block Colli- sions in MD5 and On the …
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Cryptographic Pairings: Efficiency and DLP security
… tools in cryptography, originally used for the cryptanalysis of elliptic curve cryptography, they are now used in key exchange protocols, signature schemes and Identity-based cryptography. This thesis comprises of two parts: Security and Efficient Algorithms. In Part I: Security, the security of …
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Intelligent Cipher Transfer Object for IoT Data Security
… security vulnerabilities using conventional cryptanalysis and ML. The research methodology consists of three main components. Firstly, an extensive literature review is conducted to establish a theoretical foundation and identify issues and limitations associated with existing security …
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Weyl Gröbner Basis Cryptosystems
… of Gröbner basis is, in general, EXPSPACE-hard. Cryptanalysis of these commutative Polly Cracker type cryptosystems is possible by using attacks that do not require the computation of Gröbner basis for breaking the system, for example, the attacks based on linear algebra. To secure these …
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Infinite Groebner Bases And Noncommutative Polly Cracker Cryptosystems
… of encryption. Finally, we study techniques of cryptanalysis that may be used to attack the cryptosystems that we present. We show how poorly constructed public keys can in fact, reveal the private key, and discuss techniques to design public keys that adequately conceal the private key. We also …
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Cryptography and Computer Communications Security. Extending the Human Security Perimeter through a Web of Trust
… compares favourably with SSSS. Defeating socio-cryptanalysis in cyberspace requires strategies that are centred on human trust, trust-related human attributes, and technology. The PhD research is completed but there is scope for future work.
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Ensuring reliable and secure deployment of emergent workloads on modern microprocessors
… schemes. These schemes have thus far withstood cryptanalysis, lending credence to their security claims. However, as they are now slated for real-world deployment, their resilience against side-channel and fault injection attacks must be studied as well. This thesis conducts this investigation …
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