Cryptanalysis of symmetric-key primitives and its application to backdoor design

This thesis focuses on the cryptanalysis of symmetric-key cryptography, one of the most important branches of modern cryptography. The research spans two aspects of cryptanalysis. Studying cryptanalysis provides better evaluation on the security of symmetric-key primitives. At first, we develop a ne...

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Main Author: Wang, Haoyang
Other Authors: Thomas Peyrin
Format: Thesis-Doctor of Philosophy
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/146046
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1460462023-02-28T23:56:35Z Cryptanalysis of symmetric-key primitives and its application to backdoor design Wang, Haoyang Thomas Peyrin School of Physical and Mathematical Sciences thomas.peyrin@ntu.edu.sg Science::Mathematics::Discrete mathematics::Cryptography This thesis focuses on the cryptanalysis of symmetric-key cryptography, one of the most important branches of modern cryptography. The research spans two aspects of cryptanalysis. Studying cryptanalysis provides better evaluation on the security of symmetric-key primitives. At first, we develop a new tool of boomerang attack and apply it to the analysis of the block cipher AES and the tweakable block cipher Deoxys-BC. We then introduce the technique of structure to key materials for the first time, with the help of which the currently best related key attack on full-round AES-256 can be improved. Lastly, we improve the meet-in-the-middle preimage attacks on AES hashing modes. Aside from providing security evaluation, cryptanalysis can also be used intentionally to create weakness in a cipher, so-called backdoor. We propose the MALICIOUS framework, a new method to build tweakable block ciphers that have backdoors hidden, based on differential cryptanalysis. A concrete instantiation of this framework named LowMC-M is then proposed. Doctor of Philosophy 2021-01-22T01:57:29Z 2021-01-22T01:57:29Z 2021 Thesis-Doctor of Philosophy Wang, H. (2021). Cryptanalysis of symmetric-key primitives and its application to backdoor design. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/146046 10.32657/10356/146046 en This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Mathematics::Discrete mathematics::Cryptography
spellingShingle Science::Mathematics::Discrete mathematics::Cryptography
Wang, Haoyang
Cryptanalysis of symmetric-key primitives and its application to backdoor design
description This thesis focuses on the cryptanalysis of symmetric-key cryptography, one of the most important branches of modern cryptography. The research spans two aspects of cryptanalysis. Studying cryptanalysis provides better evaluation on the security of symmetric-key primitives. At first, we develop a new tool of boomerang attack and apply it to the analysis of the block cipher AES and the tweakable block cipher Deoxys-BC. We then introduce the technique of structure to key materials for the first time, with the help of which the currently best related key attack on full-round AES-256 can be improved. Lastly, we improve the meet-in-the-middle preimage attacks on AES hashing modes. Aside from providing security evaluation, cryptanalysis can also be used intentionally to create weakness in a cipher, so-called backdoor. We propose the MALICIOUS framework, a new method to build tweakable block ciphers that have backdoors hidden, based on differential cryptanalysis. A concrete instantiation of this framework named LowMC-M is then proposed.
author2 Thomas Peyrin
author_facet Thomas Peyrin
Wang, Haoyang
format Thesis-Doctor of Philosophy
author Wang, Haoyang
author_sort Wang, Haoyang
title Cryptanalysis of symmetric-key primitives and its application to backdoor design
title_short Cryptanalysis of symmetric-key primitives and its application to backdoor design
title_full Cryptanalysis of symmetric-key primitives and its application to backdoor design
title_fullStr Cryptanalysis of symmetric-key primitives and its application to backdoor design
title_full_unstemmed Cryptanalysis of symmetric-key primitives and its application to backdoor design
title_sort cryptanalysis of symmetric-key primitives and its application to backdoor design
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/146046
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