2023 Document Preview 1 Faculty of Computer Studies T215B Communication and Information Technologies Part B Tutor Marked Assignment | Assignment Collections

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1 Faculty of Computer Studies T215B Communication and Information Technologies -Part B Tutor Marked Assignment Cut-Off Date: May 5th, 2014 Total Marks: 100 Contents Part A: Asymmetric and Symmetric key Cryptography …….………..……… 2 Part B: Data Encryption Standard (DES) ……………………………..……… 2 Part C: Simplified DES ……..…………….……………………………..……… 3 Plagiarism Warning: As per AOU rules and regulations, all students are required to submit their own TMA work and avoid plagiarism. The AOU has implemented sophisticated techniques for plagiarism detection. You must provide all references in case you use and quote another person’s work in your TMA. You will be penalized for any act of plagiarism as per the AOU’s rules and regulations. Declaration of No Plagiarism by Student (to be signed and submitted by student with TMA work): I hereby declare that this submitted TMA work is a result of my own efforts and I have not plagiarized any other person’s work. I have provided all references of information that I have used and quoted in my TMA work. Name of Student: Signature: Date: 2 Part A: Asymmetric and Symmetric keys (20 marks) From your study of Asymmetric and symmetric key cryptography, use your own words to compare between them in terms of: 1. Definition (4 marks) 2. Advantages and disadvantages (2 advantages And 2 disadvantages For each one)(8 marks) 3. Their applications (two applications for each one). (4 marks) Your answer should be no more than 250 words count. (2 marks) Any extra words mean deduction of marks. You should provide proper references and use citation (2 marks) Part B: Data Encryption Standard (DES) (35 marks) The Data Encryption Standard (DES) [1][2] is a symmetric-key algorithm for the encryption of electronic data, which you studied briefly in T215B. This task aims to assist you in learning more about the DES. Your answer should be as report which starting with introduction and ending with conclusion, the report should be within 1000 – 1200 words (long report,…