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 62 for “"Cipher"”.
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Intelligent Cipher Transfer Object for IoT Data Security
… and security analysis of the Intelligent Cipher Transfer Object (ICTO) technology, which secures data by embedding it with “self-governance” or “intelligent” modules enabling it to act on its own behalf. The study focuses on evaluating the system and network efficiency, as well as …
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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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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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Rethinking the Weakness of Stream Ciphers and Its Application to Encrypted Malware Detection
… a critical component to the security of a stream cipher: because many implementations simply consist of a key scheduling algorithm and logical exclusive or (XOR), an attacker can completely break the cipher by XORing two ciphertexts encrypted under the same key, revealing the original plaintexts …
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Error rate performance analysis of stream and block ciphers in a digital mobile communication channel.
… 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 binary BCH codes …
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Studies on Gopala-Hemachandra Codes and their Applications
… In 2014, Nalli and Ozyilmaz proposed a stream cipher based on GH codes. We show that this cipher is insecure and provide experimental results on the performance of our program that cracks this cipher.
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A pseudo one-time-pad based security system
… The One-Time-Pad, also known as the Vernam Cipher, provides unconditional security regardless of the computational resources available. This state of unconditional security is also known as perfect secrecy, and the Vernam Cipher is the only scheme capable of making that claim. There are, …
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On algebraic and statistical properties of AES-like ciphers
… (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 …
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A novel approach to symmetric cryptographic secured communication links for real-time teleoperation and telemetry
… 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 new …
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Duomenų šifravimo aplikacijos kūrimas taikant chaotinius atvaizdžius /
… For each chat in application user must choose cipher key – values of r and X0. For program these requirements were raised: • App should work on "Android" operating system. • Usage of chaotic algorithm. • Fast text message encryption. • Each chat could have separate cipher key. For testing …
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Analysis of Lightweight Cryptographic Primitives
… viable. The next primitive proposed is a block cipher combination technique based on Galois Extension Field multiplication. Using any PRNG to produce the pseudorandom stream, the block cipher combination technique generates a variable sized key matrix to encrypt plaintext. Electronic Codebook …
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Message Authentication Codes On Ultra-Low SWaP Devices
… message authentication codes (HMAC) and cipher-block-chaining message authentication code (CBC-MAC). The most important thing about ultra-low SWaP devices is their energy usage. This thesis measures different implementations' execution times on ultra-low SWaP devices. We could understand …
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On Boolean functions, symmetric cryptography and algebraic coding theory
… trapdoors that can be embedded in a block cipher. In particular we are interested in any block cipher which has invertible S-boxes and that acts as a permutation on the message space, once the key is chosen. The message space is a vector space and we can endow it with alternative operations …
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Non-Asymptotic 𝑡-Wise Independence of Substitution-Permutation Networks
… 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 this …
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Security of substitution-permutation network
In this thesis, we study the security of a block cipher design called substitution-permutation network (SPN). We prove that when S-box is chosen uniformly at random as a permutation, the resulting SPN is a strong pseudorandom permutation even against an adversary having oracle access to that S-box. …
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Security proofs for the MD6 hash function mode of operation
… composed of a compression function or block cipher that operate on fixed-length pieces of the input and a mode of operation that governs how apply the compression function or block cipher repeatedly on these pieces in order to allow for arbitrary-length inputs. Cryptographic hash functions …
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Key schedule algorithm based on coordinate geometry of a three-dimensional hybrid cube
… and decryption key in the non-binary block cipher. The generation of key space by using the 2-dimensional hybrid cubes are not sufficient to resist attacks and could easily be exploited. Therefore, the large key space is more desirable to resist any attack on the secret key. This research …
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