Advanced cryptographic system : design, architecture and FPGA implementation

PhD ThesisThe field programmable gate array (FPGA) is a powerful technology, and since its introduction broad prospects have opened up for engineers to creatively design and implement complete systems in various fields. One such area that has a long history in information and network security is cryptography, which is considered in this thesis. The challenge for engineers is to design secure cryptographic systems, which should work efficiently on different platforms with the levels of security required. In addition, cryptographic functionalities have to be implemented with acceptable degrees of complexity while demanding lower power consumption. The present work is devoted to the design of an efficient block cipher that meets contemporary security requirements, and to implement the proposed design in a configurable hardware platform. The cipher has been designed according to Shannon’s principles and modern cryptographic theorems. It is an iterated symmetric-key block cipher based on the substitution permutation network and number theoretic transform with variable key length, block size and word length. These parameters can be undisclosed when determined by the system, making cryptanalysis almost impossible. The aim is to design a more secure, reliable and flexible system that can run as a ratified standard, with reasonable computational complexity for a sufficient service time. Analyses are carried out on the transforms concerned, which belong to the number theoretic transforms family, to evaluate their diffusion power, and the results confirm good performance in this respect mostly of a minimum of 50%. The new Mersenne number transform and Fermat number transform were included in the design because their characteristics meet the basic requirements of modern cryptographic systems. A new 7×7 substitution box (S-box) is designed and its non-linear properties are evaluated, resulting in values of 2-6 for maximum difference propagation probability and 2-2.678 for maximum input-output correlation. In addition, these parameters are calculated for all S-boxes belonging to the previous and current standard algorithms. Moreover, three extra S-boxes are derived from the new S-box and another three from the current standard, preserving the same non-linear properties by reordering the output elements. The robustness of the proposed cipher in terms of differential and linear cryptanalysis is then considered, and it is proven that the algorithm is secure against such well-known attacks from round three onwards regardless of block or key length. A number of test vectors are run to verify the correctness of the algorithm’s implementation in terms of any possible error, and all results were promising. Tests included the known answer test, the multi-block message test, and the Monte Carlo test. Finally, efficient hardware architectures for the proposed cipher have been designed and implemented using the FPGA system generator platform. The implementations are run on the target device, Xilinx Virtex 6 (XC6VLX130T-2FF484). Using parallel loop-unrolling architecture, a high throughput of 44.9 Gbits/sec is achieved with a power consumption of 1.83W and 8030 slices for implementing the encryption module with key and block lengths of 16×7 bits. There are a variety of outcomes when the cipher is implemented on different FPGA devices as well as for different block and key lengths.Ministry of Higher Education and Scientific Research in Ira

Modeling risk analysis of a layered commercial solution for a classified program when a patient attacker is present

Layered security systems pose significant challenges while attempting to monitor security related activities. The varying attributes embedded within each layer as well as the attribute interdependencies within and across layers takes measurement complexity to an exponential state. The many interdependencies at play in an interconnected infrastructure further exacerbates the ability to measure overall security assurance. Then enters the patient attacker who infiltrates one layer of this security system and waits for the opportune time to infiltrate another layer. The ability to simulate and understand risk with respect to time in this dynamic environment is critical to the decision maker who must work under time and cost constraints. This thesis seeks to improve methods for interdependent risk assessment particularly when a patient attacker is present

General Course Catalog [July-December 2020]

Undergraduate Course Catalog, July-December 2020https://repository.stcloudstate.edu/undergencat/1132/thumbnail.jp

General Course Catalog [January-June 2020]

Undergraduate Course Catalog, January-June 2020https://repository.stcloudstate.edu/undergencat/1131/thumbnail.jp

General Course Catalog [July-December 2019]

Undergraduate Course Catalog, July-December 2019https://repository.stcloudstate.edu/undergencat/1130/thumbnail.jp

General Course Catalog [July-December 2018]

Undergraduate Course Catalog, July-December 2018https://repository.stcloudstate.edu/undergencat/1128/thumbnail.jp

General Course Catalog [January-June 2019]

Undergraduate Course Catalog, January-June 2019https://repository.stcloudstate.edu/undergencat/1129/thumbnail.jp

General Course Catalog [January-June 2018]

Undergraduate Course Catalog, January-June 2018https://repository.stcloudstate.edu/undergencat/1127/thumbnail.jp

General Course Catalog [July-December 2017]

Undergraduate Course Catalog, July-December 2017https://repository.stcloudstate.edu/undergencat/1126/thumbnail.jp