Reference no: EM13317632

Part A: Asymmetric and Symmetric keys

From your study of Asymmetric and symmetric key cryptography, use your own words to compare between them in terms of:

1. Definition
2. Advantages and disadvantages (2 advantages And 2 disadvantages For each one)
3. Their applications (two applications for each one).
Your answer should be no more than 250 words count. Any extra words mean deduction of marks.
You should provide proper references and use citation

Part B: Data Encryption Standard (DES)

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, you should adhere to word count), the report should include sections and sub suctions, and at least one figure or table, your report must have proper citations and references. The body of your report should answer the following questions:

1. Define DES?
2. What is the history of DES?
3. Describe the key generation of the Simplified DES algorithm? It is preferable to answer it as a list of points.
4. Describe Simplified DES algorithm? It is preferable to answer it as a list of points.
5. What are the advantages and disadvantages of DES - at least 2 advantages And 2 disadvantages?
6. Is DES secure mechanism to protect electronic data at the present time, justify your answer?

Part C: Simplified DES

This part is a practical task. Based on the previous study of DES in Part B, you have to test the algorithm but using the Simplified DES.

1. ASCII code is a fixed-length coding scheme. Using the 7-bit ASCII code table [3] or any other references, find the corresponding code for the first letter of your first name, add 1 to the left position of the most significant bit (MSB), for example your name is Xxxx Ssss, the first letter is X, its ASCII is 1011000, adding 1 to the left position of MSB yields to 11011000. These bits sequence is the message that you
will encrypt using the Simplified DES algorithm.

2. Based on the understanding of Q3 of Bart B, use the 10 bits password (1100110010) to generate the keys (K1 and K2).

Your answer should be detailed, you should show each output of each step of the algorithm besides the final answers.

3. Based on the understanding of Q4 of Bart B, use the generated keys of Q2 - Part C to encrypt the message of Q1 - Part C using the Simplified DES algorithm.

Your answer should be detailed, you should show each output of each step of the algorithm besides the final answer.

4. How many bits is the encrypted message?

REFERENCES:

[1] Stallings, William. "Cryptography and Network Security", 2nd Edition
[2] https://mercury.webster.edu/aleshunas/COSC%205130/G-SDES.pdf
[3] https://www.asciitable.pro/ascii_table.htm
[4] https://homepages.gac.edu/~holte/courses/mcs150-J01/documents/DESexample.html