Randomness Evaluation of Modified Lblock Cipher

This thesis present the analysis conducted towards one of the latest Lightweight Block Cipher; LBlock Cipher and its modified version; Modified LBlock Cipher – Design 1 and Design 2. The analysis conducted is a statistical analysis, which is to study the randomness properties of these three block ci...

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Main Author:	Nik Azura Binti Nik Abdullah
Format:	Thesis
Language:	English
Subjects:	Computer algorithms Data encryption (Computer science) Block Cipher (Computer science)
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spelling	my-usim-ddms-127132024-05-29T04:42:35Z Randomness Evaluation of Modified Lblock Cipher Nik Azura Binti Nik Abdullah This thesis present the analysis conducted towards one of the latest Lightweight Block Cipher; LBlock Cipher and its modified version; Modified LBlock Cipher – Design 1 and Design 2. The analysis conducted is a statistical analysis, which is to study the randomness properties of these three block cipher algorithms. Among the important requirement when designing a block cipher algorithm is that the algorithm can act as a random number generator. However, randomness analysis has never been performed before towards LBlock Cipher. The aim of performing modification towards LBlock Cipher is to enhance its randomness results. Two designs were constructed for modification of LBlock Cipher. Modification were made in Confusion Function, S of Round Function, F by replacing the eight 4 X 4 S-boxes. For Modified LBlock Cipher- Design 1 four 16 X 16 AES S-boxes are used, whereas for Modified LBlock Cipher – Design 2 four 16 X 16 different S-boxes which has same properties as AES S- box are used.During experimentation, this research project considers full rounds LBlock Cipher and Modified LBlock Cipher – Design 1 and Design 2 algorithms, which all three algorithms accepts a 64-bit plaintext, utilizes an 80-bit key, executes in 32 rounds and produces a 64-bit ciphertext. NIST Statistical Test Suite consisting of sixteen tests separated into two categories; Non-Parameterized Test Selection and Parameterized Test Selection was used to conduct testing and analysis, and the significance levels were set from 1% - 5%. Blocks of ciphertext were generated from these algorithms and were concatenated to construct a binary sequence. Nine different data categories were used to generate inputs (plaintext and key), with each having 100 samples. Comparison were made between statistical analysis results gathered for all three algorithms. It is shown that Modified LBlock Cipher – Design 2 produced better analysis results and has successfully enhance the randomness results of its original design. At 1% significance level, this design is 43% better compared to the original design, and at 2% - 5% significance levels, it is more than 50% better. Universiti Sains Islam Malaysia 2016-03 Thesis en https://oarep.usim.edu.my/handle/123456789/12713 https://oarep.usim.edu.my/bitstreams/5a32374b-d1f4-4129-8a23-9e4ed00f2708/download 8a4605be74aa9ea9d79846c1fba20a33 Computer algorithms Data encryption (Computer science) Block Cipher (Computer science)
institution	Universiti Sains Islam Malaysia
collection	USIM Institutional Repository
language	English
topic	Computer algorithms Data encryption (Computer science) Block Cipher (Computer science)
spellingShingle	Computer algorithms Data encryption (Computer science) Block Cipher (Computer science) Nik Azura Binti Nik Abdullah Randomness Evaluation of Modified Lblock Cipher
description	This thesis present the analysis conducted towards one of the latest Lightweight Block Cipher; LBlock Cipher and its modified version; Modified LBlock Cipher – Design 1 and Design 2. The analysis conducted is a statistical analysis, which is to study the randomness properties of these three block cipher algorithms. Among the important requirement when designing a block cipher algorithm is that the algorithm can act as a random number generator. However, randomness analysis has never been performed before towards LBlock Cipher. The aim of performing modification towards LBlock Cipher is to enhance its randomness results. Two designs were constructed for modification of LBlock Cipher. Modification were made in Confusion Function, S of Round Function, F by replacing the eight 4 X 4 S-boxes. For Modified LBlock Cipher- Design 1 four 16 X 16 AES S-boxes are used, whereas for Modified LBlock Cipher – Design 2 four 16 X 16 different S-boxes which has same properties as AES S- box are used.During experimentation, this research project considers full rounds LBlock Cipher and Modified LBlock Cipher – Design 1 and Design 2 algorithms, which all three algorithms accepts a 64-bit plaintext, utilizes an 80-bit key, executes in 32 rounds and produces a 64-bit ciphertext. NIST Statistical Test Suite consisting of sixteen tests separated into two categories; Non-Parameterized Test Selection and Parameterized Test Selection was used to conduct testing and analysis, and the significance levels were set from 1% - 5%. Blocks of ciphertext were generated from these algorithms and were concatenated to construct a binary sequence. Nine different data categories were used to generate inputs (plaintext and key), with each having 100 samples. Comparison were made between statistical analysis results gathered for all three algorithms. It is shown that Modified LBlock Cipher – Design 2 produced better analysis results and has successfully enhance the randomness results of its original design. At 1% significance level, this design is 43% better compared to the original design, and at 2% - 5% significance levels, it is more than 50% better.
format	Thesis
author	Nik Azura Binti Nik Abdullah
author_facet	Nik Azura Binti Nik Abdullah
author_sort	Nik Azura Binti Nik Abdullah
title	Randomness Evaluation of Modified Lblock Cipher
title_short	Randomness Evaluation of Modified Lblock Cipher
title_full	Randomness Evaluation of Modified Lblock Cipher
title_fullStr	Randomness Evaluation of Modified Lblock Cipher
title_full_unstemmed	Randomness Evaluation of Modified Lblock Cipher
title_sort	randomness evaluation of modified lblock cipher
granting_institution	Universiti Sains Islam Malaysia
_version_	1812444917706784768

Randomness Evaluation of Modified Lblock Cipher

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