CSCI361 - Cryptography and Secure Applications - Computer Science Assignment Help

Assignment Task

Aims:

1. To gain a basic familiarity with some security concepts, and with classical ciphers, including statistical methods for cryptanalysis of them.

2. To become familiar with block ciphers, mode of operations, the importance of S-box and cryptanalysis of linear cipher. In this assignment, you will implement two “mini” versions of DES called LDES and MDES which work on 4-bit block message and 2-bit key. In the first algorithm LDES, the S-box is removed and replaced with a linear operation making LDES a linear cipher. You will perform cryptanalysis on LDES. The second algorithm MDES has a S-box and it is secure against linear cryptanalysis. 3. To understand classical cipher, modern block cipher and stream cipher. Instruction:

• For programming part, apart from the code, you need to submit a report with instruction how to compile and run your code. Your code must be compilable with the instructions you provide. If it does not, your score for the programming part will be deducted significantly.

• Your answers to non-programming questions should be typed up in a single report file. Do not use multiple files for the different parts of questions!

• Do not type out the questions in your report.

• Clearly label which questions your answers are associated with.

• There is no need to include a title page or cover sheet but please include your name, username and student number at the start of the document.

• Include a list of any reference material you have used at the end of the report. Note where you have used it at the point of use.

• For programming questions, you can use either C++ or Java to implement your solution.

• Do not copy work from others, give solutions to others or copy directly from websites.

Plagiarism is taken seriously and is likely to result in a zero mark for the assignment for all the students involved.

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