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.
Results
Showing 1 to 20 of 22 for “"Block Ciphers"”.
-
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 …
-
Error rate performance analysis of stream and block ciphers in a digital mobile communication channel.
… 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 (CFB) modes are considered. The ability of …
-
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.
-
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 …
-
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 …
-
Brute-force resistant Pointer-Authentication using RISC-V co-processor
… in 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 …
-
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 …
-
A novel approach to symmetric cryptographic secured communication links for real-time teleoperation and telemetry
… results in the design and implementation of new block cipher structures, designated the Permutation Substitution Network (PSN) and the Permutation Substitution Permutation Network (PSPN). Applying the PSN and PSPN structures enables the derivation of the Big Cat family of block ciphers which is a …
-
Product cipher negotiation with on-line evaluation for private communication over computer networks
… computer 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 …
-
On algebraic and statistical properties of AES-like ciphers
… Standard (AES) is nowadays the most widespread block cipher in commercial applications. It represents the state-of-art in block cipher design and provides an unparalleled level of assurance against all known cryptanalytic techniques, except for its reduced versions. Moreover, there is no known …
-
Design and analysis of hash functions
… currently are hash functions based on block ciphers and the dedicated hash functions. Almost all the dedicated hash functions are generated using the Merkle-Damgård construction which is developed independently by Merkle and Damgård in 1989 [6, 7]. A hash function is said to be broken …
-
Non-Asymptotic 𝑡-Wise Independence of Substitution-Permutation Networks
… this thesis, we study the 𝑡-wise independence of block ciphers following the Substitution-Permutation Network design to prove resilience against cryptanalytic attacks and show non-asymptotic bounds for two widely-used ciphers. There are two main contributions of this thesis. In the first part of …
-
Support for Accessible Bitsliced Software
… high efficiency in certain situations, including block ciphers computation, it has been used in designs to resist hardware attacks. However, this technique requires both program and data to be in a specific format. This requirement makes writing bitsliced software by hand laborious and adds …
-
Implementation of SCA-Resistant CPU and an ECDLP Engine on FPGA Platform
… countermeasure applies to a broad class of block ciphers that consist of lookup tables and logical operations. While many countermeasures have been proposed previously, we show that our solution achieves an excellent trade-off between SCA resistance, (software and hardware) design …
-
Adaptive chosen all inputs model for analyzing key derivation functions against bit-flip and timing side-channel attacks
… are constructed using hash functions, stream ciphers, and block ciphers. Different constructions of KDFs have resulted in different timing variation. The timing variation can reveal the length of private string and the types of cryptographic primitives used to build the KDFs. Hence, this …
-
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 …
-
Advances in the Side-Channel Analysis of Symmetric Cryptography
… on symmetric cryptographic primitives, namely: block-ciphers and hashing functions. In the first part, we focus on improving side-channel attacks. First, we propose a new method to profile highly parallel cryptographic modules. Profiling, in the context of SCA, characterizes the power …
-
Fault Attacks on Cryptosystems: Novel Threat Models, Countermeasures and Evaluation Metrics
… successfully launched on AES, PRESENT and LED block ciphers. Our group has also recently proposed this attack on the AES algorithm running on a LEON3 processor. In our work, we also propose a countermeasure against one of the most powerful types of fault attacks, namely, Fault Sensitivity …
-
Context Aware and Adaptive Security for Wireless Networks
This research investigated methods to determine appropriate security protocols for specific wireless network applications. The specific problem being addressed was that there are tradeoffs between security, performance, and efficiency among current and proposed security protocols. Performance and …
Page 1 of 2