Implementation of a Generic Modular Cryptosystem for the RSA on Reconfigurable Hardware

This report summarizes the work that was initiated from the summer of 2008, on the study and analysis of cryptographic design techniques and their implementation on an FPGA board,i.e. the Virtex II pro. The study began with the understanding of a popular HDL language, namely, Verilog. Based on the study an implementation of a modular cryptosystem based on the RSA and generic upto a 256 bit modulus was realized. Optimal techniques for developing a high speed RSA cryptosystem is presented in this work. Through out the thesis the primary tool was the Xilinx based ISE toolkit. However for validation purposes other simulators such as ModelSim was also used. However, the simulations presented in this work utilizes the Xilinx ISE 10.1 Simulator environment. The Xilinx XST 10.1 was used in the synthesis of the implementation. The division technique utilized a modified non-restoring division scheme. The multiplication scheme used the Karatsuba-Ofman technique. The exponentiation scheme used was the Montgomery Modular exponentiation. The inversion scheme used a modified form of the Extended Euclidean Algorithm which involves no division or multiplication as suggested by Laszlo Hars. The thesis concludes with suggestions on extending the present implementation of RSA on FPGA

Sexual dysfunction in females with depression: a cross-sectional study

Abstract Introduction Female sexual dysfunction (FSD) in depression albeit common is strikingly understudied. The condition, if addressed properly, can be readily cured, improving the quality of life of the patient. Methods A consecutive sample of drug-naïve married female patients with depression was assessed. Depression was diagnosed using the Structured Clinical Interview for DSM-IV Axis I Disorders (SCID-I). Depression severity was assessed using the Hamilton Depression Rating Scale (HAM-D), and sexual dysfunction, the Female Sexual Function Index (FSFI). Results Sexual dysfunction was found in 90% of the patients in our study. Patients with medical comorbidities showed a significant decrease in the desire subset of the FSFI (Mann-Whitney U=11.0, p=0.009), however there was no significant association with other subsets. Patients who expressed passive death wishes had higher scores on all indicators of sexual function and a significantly higher score in the orgasm subset of the FSFI (Mann-Whitney U=11.0, p=0.009). Conclusion The study showed a high prevalence of FSD in depressed females regardless of type and severity of depression. Depression with medical comorbidities was associated with a significant decrease in desire. Patients who expressed passive death wishes showed improved sexual function and significantly better orgasm