Cryptography and Security: Assignment 2 - Analysis of DES and AES Algorithms

CSC8419 - CRYPTOGRAPHY AND SECURITY - ASSIGNMENT 2

Table of Contents
Task 1...............................................................................................................................................2
Task 2...............................................................................................................................................5
Task 3...............................................................................................................................................9
Task 4.............................................................................................................................................10
References......................................................................................................................................13
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Task 1
Verification of the Debian DVD ISO image
For the verification, the entire files have been downloaded from the website:
https://goo.gl/8CNeyc . In order to check the completeness of the ISO images including its
signature files for SHA-1, the following steps are done.
 In the first step, entire files are documented in the directory so that every file should be at
the proper place
 Now go for the check for correct signature with the help of GNU Privacy Guard. This
check is for SHA-1.
As the command will run for the first time, there is no availability of the public key on
the system. This command will let the result as ID= ‘6294BE9B’. This ID will help in
retrieving the public key as explained in the step below.
 Now, from the Debian key server, download the public key by using the ID ‘6294BE9B’
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 In this step, the verification is done on both the checksum files by comparing the
signature files
In order to confirm the authenticity of the image of Debian DVD, a statement is appeared
as “Good signature from "Debian CD signing key <[e-mail]>”. For
the comparison of the listed key in the link: https://www.debian.org/CD/verify, the
generated fingerprint key is used and the key is DF9B 9C49 EAA9 2984 3258 9D76
DA87 E80D 6294 BE9B which matches to the listed fingerprint keys.
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