Cryptanalysis of lightweight block ciphers
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School of Science |
Master's thesis
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Date
2011
Department
Major/Subject
Tietokoneverkot
Mcode
T-110
Degree programme
Language
en
Pages
82 s. + liitt. 4
Series
Abstract
One of the ways to provide information security is cryptography. Traditionally, cryptographic operations as encryption of data have been applied to protect the information contained in a centralized and powerful computing environment. So, cryptography has been associated with powerful computing environment. But miniaturization of devices and their wide prevalent use in storing and transmitting sensitive and personal information raises important question for the security of the transmitted or stored information. These devices have severe resource constraint as per the needs of traditional cryptographic primitives. In recent past, the research community has focused designing of cryptographic primitives which are suited to these resource constrained devices. This area of research area is termed as lightweight cryptography. This thesis work summarizes the design criteria of lightweight block ciphers which is one of the various primitives of the lightweight cryptography. It also presents a detailed design analysis of some of the recently designed block ciphers. We will explain the various metrics that is used for evaluation of lightweight cryptography. One of the main questions that arise in the design of any cryptographic algorithms is the security. The major part of this thesis investigates the security of the lightweight block cipher. We investigated whether the choice of a simple round function impacts the security of the cipher. It focuses on recently designed ciphers e.g. KLEIN, LED, and LBlock. The main contribution of this thesis is analysis of 8 round practical attack on KLEIN. We extend this previous work for practical attack on 9 round of KLEIN. We also present properties and analysis of the structure, key schedule of other ciphers. Along with this, we give a brief introduction to state of art of lightweight design of block ciphers and various cryptanalytic techniques.Description
Supervisor
Aura, TuomasThesis advisor
Biryukov, AlexKeywords
lightweight cryptography, cryptanalysis, differential, gate equivalents