write a Conclusion and Implementation of File Integrity Management System using HMAC based on MD5

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CSIT 495/595 – Introduction to Cryptography
Course Project
Members:
Guided by:
Implementation of File Integrity Management System using HMAC based on
MD5
Introduction:
The MD5 algorithm is a widely used hash function producing a 128-bit hash value.
Although MD5 was initially designed to be used as a cryptographic hash function, it has been
found to suffer from extensive vulnerabilities. It can still be used as a checksum to verify data
integrity, but only against unintentional corruption.
Data integrity is a fundamental component of information security. In its broadest use,
“data integrity” refers to the accuracy and consistency of data stored in a database, data
warehouse, data mart or other construct. The term – Data Integrity – can be used to describe a
state, a process or a function – and is often used as a proxy for “data quality”. Data with
“integrity” is said to have a complete or whole structure. Data values are standardized according
to a data model and/or data type.
Project Implementations:
PHP apache was used as the preferred language / tool to implement the project. The PHP
standard library for md5 hashing function was used as the preferred hashing algorithm.
Implementation steps as follows:
1) Defining the input folder and output folders,
“/Testfolders/directory1/”
“/Testfolders/directory2/”
2) Reading files inside the input folder (Directory 1)
3) Creating a copy of input files with md5 has on the output folder. (Directory 2)
?file name format on output folder “filename”+ “-hash”
4) Then we compare the input folder hashed value with corresponding output folder has hashed
content.
5) If the hashes match then we show “Yes” else “No”
Problems & Resolutions:
1) The code was showing errors and now running when absolute path to the folders was not
specified. To address the issue had used the function “ dirname(__FILE__)”and the specify the
files by that absolute path.
2) We had to use the scandir function to dynamically read from input file and creating output
files with hash
3) The function file_get_contents was not working when special flag
FILE_USE_INCLUDE_PATH was not specified.
Conclusion:
References:
1. Introduction to Modern Cryptography by Jonathan Katz and Yehuda Lindell, 2nd Edition,
Chapman & Hall/CRC, 2014. ISBN-13: 978-1466570269.
2. Cryptography: Theory and Practice by Douglas R. Stinson, 3rd Edition, Chapman & Hall/CRC,
2005. ISBN-13: 978-1584885085
3. https://en.wikipedia.org/wiki/MD5
4. http://locutus.io/php/strings/md5/
5. http://php.net/manual/en/function.hash-copy.php

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