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    Pensim for Intel Architecture

    , M.Sc. Thesis Sharif University of Technology Nasrollahi, Mahdi (Author) ; Vosughi Vahdat, Bijan (Supervisor) ; Mortazavi, Mohammad (Supervisor)
    To capture what is really done on the computer, we have decided to simulate the behavior of an Intel processor based computer. The main part of a computer is its CPU, so we are have simulated the Intel processors from 8086 to Pentium with MMX, SSEX and 3DNow. To work with hardware and software and going back to these steps for several times, is a time consuming procedure. To avoid falling in such loops, one way is to simulate the hardware and develop the software according to this simulation. This remedy solves time consuming procedure since changing hardware in simulation is quite easy. To simulate the digital systems, we need to have the software codes of the processors. Since the Intel... 

    Preventing database schema extraction by error message handling

    , Article Information Systems ; Volume 56 , 2016 , Pages 135-156 ; 03064379 (ISSN) Naghdi, S ; Amini, M ; Sharif University of Technology
    Elsevier Ltd 
    Nowadays, a large volume of an organization's sensitive data is stored in databases making them attractive to attackers. The useful information attackers try to obtain in the preliminary steps, is the database structure or schema. One of the popular approaches to infer and extract the schema of a database is to analyze the returned error messages from its DBMS. In this paper, we propose a framework to handle and modify the error messages automatically in order to prevent schema revealing. To this aim, after identifying and introducing an appropriate set of categories of error messages, each error message that is returned from a DBMS is placed in a proper category. According to the policy...