Impossible differential cryptanalysis of reduced round HIGHT

Download

index.pdf

Date

2009

Author

Tezcan, Cihangir

Metadata

Show full item record

Item Usage Stats

163
views

65
downloads

Design and analysis of lightweight block ciphers have become more popular due to the fact that the future use of block ciphers in ubiquitous devices is generally assumed to be extensive. In this respect, several lightweight block ciphers are designed, of which HIGHT is proposed by Hong et al. at CHES 2006 as a constrained hardware oriented block cipher. HIGHT is shown to be highly convenient for extremely constrained devices such as RFID tags and sensor networks and it became a standard encryption algorithm in South Korea. Impossible differential cryptanalysis is a technique discovered by Biham et al. and is applied to many block ciphers including Skipjack, IDEA, Khufu, Khafre, HIGHT, AES, Serpent, CRYPTON, Twofish, TEA, XTEA and ARIA. The security of HIGHT against impossible differential attacks is investigated both by Hong et al. and Lu: An 18-round impossible differential attack is given in the proposal of HIGHT and Lu improved this result by giving a 25-round impossible differential attack. Moreover, Lu found a 28-round related-key impossible differential attack which is the best known attack on HIGHT. In related-key attacks, the attacker is assumed to know the relation between the keys but not the keys themselves. In this study, we further analyzed the resistance of HIGHT against impossible differential attacks by mounting a new 26-round impossible differential attack and a new 31-round related-key impossible differential attack. Although our results are theoretical in nature, they show new results in HIGHT and reduce its security margin further.

Subject Keywords

Cryptography.

URI

http://etd.lib.metu.edu.tr/upload/12610761/index.pdf
https://hdl.handle.net/11511/18703

Collections

Graduate School of Applied Mathematics, Thesis

Suggestions

OpenMETU
Core

Basic cryptanalysis methods on block ciphers Çelik, Dilek; Doğanaksoy, Ali; Department of Cryptography (2010) Differential cryptanalysis and linear cryptanalysis are the first significant methods used to attack on block ciphers. These concepts compose the keystones for most of the attacks in recent years. Also, while designing a cipher, these attacks should be taken into consideration and the cipher should be created as secure against them. Although di fferential cryptanalysis and linear cryptanalysis are still important, they started to be ine cient due to the improvements in the technology. So, these attacks are ...
Combined attacks on block ciphers Öztop, Neşe; Doğanaksoy, Ali; Department of Cryptography (2009) Cryptanalytic methods are very important tools in terms of evaluating the security of block ciphers in a more accurate and reliable way. Differential and linear attacks have been the most effective cryptanalysis methods since the early 1990s. However, as the technology developed and more secure ciphers are designed, these fundamental methods started to be not so efficient. In order to analyze the ciphers, new methods should be introduced. One approach is inventing new techniques that are different from the ...
On statistical analysis of synchronous stream ciphers Sönmez Turan, Meltem; Doğanaksoy, Ali; Department of Cryptography (2008) Synchronous stream ciphers constitute an important class of symmetric ciphers. After the call of the eSTREAM project in 2004, 34 stream ciphers with different design approaches were proposed. In this thesis, we aim to provide a general framework to analyze stream ciphers statistically. Firstly, we consider stream ciphers as pseudo random number generators and study the quality of their output. We propose three randomness tests based on one dimensional random walks. Moreover, we theoretically and experimenta...
Lightweight Block Ciphers Revisited: Cryptanalysis of Reduced Round PRESENT and HIGHT Ozen, Onur; Varici, Kerem; Tezcan, Cihangir; Kocair, Celebi (2009-07-03) Design and analysis of lightweight block ciphers have become more popular due to the fact that the future use of block ciphers in ubiquitous devices is generally assumed to be extensive. In this respect, several lightweight block ciphers are designed, of which PRESENT and HIGHT are two recently proposed ones by Bogdanov et al. and Hong et al. respectively. In this paper, we propose new attacks on PRESENT and HIGHT. Firstly, we present the first related-key cryptanalysis of 128-bit keyed PRESENT by introduci...
Design and analysis of hash functions Koçak, Onur; Doğanaksoy, Ali; Department of Cryptography (2009) Hash functions are cryptographic tools that are used in various applications like digital signature, message integrity checking, password storage and random number generation. These cryptographic primitives were, first, constructed using modular arithmetical operations which were popular at that time because of public key cryptography. Later, in 1989, Merkle and Damgard independently proposed an iterative construction method. This method was easy to implement and had a security proof. MD-4 was the first has...

Citation Formats

C. Tezcan, “Impossible differential cryptanalysis of reduced round HIGHT,” M.S. - Master of Science, Middle East Technical University, 2009.