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Showing 1 to 9 of 9 for “"Stream Ciphers"”.
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Stream ciphers and linear complexity
… the 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 …
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Cryptanalysis of Selected Stream Ciphers
… 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 state recovery attack. This attack …
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Rethinking the Weakness of Stream Ciphers and Its Application to Encrypted Malware Detection
… use is 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 …
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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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Cyclic Codes: Low-Weight Codewords and Locators
… ingredient of correlation attacks to LFSR-based stream ciphers. The best general purpose algorithm is based on the generalized birthday problem. In the first part of the thesis I show an alternative approach based on discrete logarithms which has - in some cases relevant for applications - much …
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Adaptive chosen all inputs model for analyzing key derivation functions against bit-flip and timing side-channel attacks
… attack. The result showed that only the stream cipher based KDF is vulnerable to the bit-flipping attack. However, all the existing KDFs are vulnerable to the timing side-channel attack. Finally, this research conducts the practical timing side-channel attack on KDFs that are constructed …
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SAT Solving Using XOR-OR-AND Normal Forms and Cryptographic Fault Attacks
… and 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 …
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Hardware Implementations for Symmetric Key Cryptosystems
… of two members of the Welch-Gong (WG) family of stream ciphers, the WG$left(29,11right)$ and WG-$16$, are considered for the mobile communications domain. Optimizations in the WG$left(29,11right)$ stream cipher are considered when the $GFleft(2^{29}right)$ elements are represented in either the …
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Studies on Gopala-Hemachandra Codes and their Applications
… exist. 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.