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 55 for “"ciphers"”.
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Stream ciphers and linear complexity
… mathematical analysis of the security of stream ciphers. Firstly, we will introduce the background ofstream ciphers with their design principles and theoretical security from the information theory viewpoint. Then we will introduce thealgebraic tools for the analysis of linear recurring sequences …
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Cryptanalysis of Selected Stream Ciphers
… 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 state recovery attack. This attack works …
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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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A study of Luby-Rackoff ciphers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Neural Cryptanalysis for Cyber-Physical System Ciphers
… relative security strength measure for symmetric ciphers, particularly for proprietary cyber-physical systems (CPS) and lightweight block ciphers. This thesis work extends the work of the recently-developed neural cryptanalysis method, which trains neural networks on a set of plaintext/ciphertext …
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On algebraic and statistical properties of AES-like ciphers
… permutations. The AES (and other modern block ciphers) presents a highly algebraic structure, which led researchers to exploit it for novel algebraic attacks. These tries have been unsuccessful, except for academic reduced versions. Starting from an intuition by I. Toli, we have developed a …
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Dynamic key scheduling algorithm for block ciphers using quasigroup string transformation
Cryptographic ciphers depend on how quickly the key affects the output of the ciphers (ciphertext). Keys are traditionally generated from small size input (seed) to a bigger size random key(s). Key scheduling algorithm (KSA) is the mechanism that generates and schedules all sub-keys for each round …
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Rethinking the Weakness of Stream Ciphers and Its Application to Encrypted Malware Detection
… 4 (RC4), ChaCha20-Poly1305, and Salsa20 stream ciphers as well as block cipher modes of operation that perform similarly to stream ciphers, such as: Counter (CTR), Galois/Counter (GCM), and Output feedback (OFB) modes. The discriminatory scheme proposed in this study perfectly detects …
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Error rate performance analysis of stream and block ciphers in a digital mobile communication channel.
This thesis analyses the effect of encrypting data on the bit error rate at the receiver. Block and stream cipher modes based on the Data Encryption Standard (DES) are examined. More specifically, Electronic Code Book (ECB), Cipher Block Chaining (CBC), Output FeedBack (OFB) and Cipher FeedBack …
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New tools in cryptography : mutually independent commitments, tweakable block ciphers, and plaintext awareness via key registration
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.
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Differential attacks using alternative operations and block cipher design
Block ciphers and their security are the main subjects of this work. In the first 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 …
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Architecture Support for Countermeasures against Side-Channel Analysis and Fault Attack
… to disclose the secret key used in cryptographic ciphers with even fewer measurements. This is of practical concern due to the ubiquity of embedded systems that allow physical access to the adversary such as smart cards, ATMs, etc.. Researchers through the years have come up with techniques to …
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STRENGTH EVALUATION OF CRYPTOGRAPHIC PRIMITIVES TO LINEAR, DIFFERENTIAL AND ALGEBRAIC ATTACKS.
… different kinds of cryptanalysis for symmetric ciphers, differential, linear and algebraic, applying them to several symmetric ciphers, from the older ones to the most modern. The algebraic approach consists in solving a polynomial system of equations representing a cryptographic primitive and …
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Analysis and Design of Symmetric Cryptographic Algorithms
… of those attacks. In particular, we target block ciphers with a lightweight and (often) non-bijective key schedule where the derived subkeys are (almost) independent from each other. An attacker who is able to reconstruct one of the subkeys is thus not necessarily able to directly retrieve other …
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Genetic Algorithm Stream Cipher Key Generation Using NIST Functions
Stream ciphers are beneficial because of their efficiency, speed, and low resource utilization. However, stream ciphers are vulnerable to many attacks if they do not use strong keys for encryption and decryption. Thus, one way to increase the security of stream ciphers is to improve the key …
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Product cipher negotiation with on-line evaluation for private communication over computer networks
… communications, using symmetric product block ciphers. The security protocol involved a cipher negotiation stage, in which two communicating parties select privately a cipher from a public cipher space. The cipher negotiation process includes an on-line cipher evaluation stage, in which the …
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SAT Solving Using XOR-OR-AND Normal Forms and Cryptographic Fault Attacks
… logical techniques to cryptanalysis of stream ciphers. We introduce a formal guess-and-determine (GD) framework using a logical abstraction of the information flow in the internal state. From an algebraic point of view, we can then find optimal GD attacks utilizing a Gröbner basis. As a case …
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Brute-force resistant Pointer-Authentication using RISC-V co-processor
… the upper bits in pointers using tweakable block ciphers like QARMA [1], but these 16-bit PAC space remains susceptible to brute-force attacks, particularly under speculative execution vulnerabilities such as PACMAN [2]. To overcome these limitations, this thesis proposes a pointer encryption …
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