Write a bash script to check the hash value of a file

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Reference no: EM133958670

Securing Networks

A combination of Cyber Security questions including programming

Question 1 - Substitution Cipher.

You are given a substitution-box (S-box) as shown below:

   00   01   10   11
00   1101   0001   1011   0100
01   0010   1111   1000   0110
10   0000   1100   0011   1110
11   0101   1001   0111   1010

Your task: For full marks, list all the steps of finding the substitutions for the decimal numbers 9, 5, and 14 using the above S-box.Submission: A .pdf file listing all the steps clearly.

Question 2: Write a bash script to check the hash value of a file (using the openssl toolkit).

You are given a folder hash files.zip containing five binary files (named as hash val i.bin for i = 1, 2, 3, 4, 5), which contain five different hash values (you can read the values by opening the files). We are looking for a specific file which matches the hash value returned by implementing the hashing algorithm SHA1 on the file rainbrowcrack-1.7-linux64.zip. Get AI-free online assignment help from experienced academic experts.

Your task: Please write a bash script to find the correct file. More specifically, you have to generate the SHA1 value of the file rainbrowcrack-1.7-linux64.zip, and then go through each of the five files to determine which file contains the SHA1 value you generated. An expected output is shown in Figure 1 below (yes, the correct file is hash val 3.bin).

109_An expected output.jpg

Figure 1: An expected output for Question 2

Your bash script file with proper and sufficient comments.
Your test result, i.e., the output after running your bash script. An expected output is shown in Figure 1.

Reference no: EM133958670

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