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Title:
improved impossible differential cryptanalysis of reduced-round camellia
Author: Wu Wenling ; Zhang Lei ; Zhang Wentao
Source: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Conference Name: 15th International Workshop on Selected Areas in Cryptography
Conference Date: AUG 14-15,
Issued Date: 2009
Conference Place: Sackville, CANADA
Keyword: Block cipher ; Camellia ; Impossible differential ; Cryptanalysis ; Round subkey
Publisher: SELECTED AREAS IN CRYPTOGRAPHY
Publish Place: HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY
ISSN: 0302-9743
ISBN: 978-3-642-04158-7
Department: Wu, Wenling; Zhang, Lei; Zhang, Wentao Chinese Acad Sci, State Key Lab Informat Secur, Inst Software, Beijing 100190, Peoples R China.
Sponsorship: AceCrypt, Int Assoc Cryptol Res
English Abstract: The block cipher Camellia has now been adopted as an international standard by ISO/IEC, and it has also been selected to be Japanese CRYPTREC e-government recommended cipher and in the NESSIE block cipher portfolio. Most recently, Wu et al constructed some 8-round impossible differentials of Camellia, and presented an attack on 12-round Camellia-192/256 in 5. Later in 6, Lu et al improved the above attack by using the same 8-round impossible differential and some new observations on the diffusion transformation of Camellia. Considering that all these previously known impossible differential attacks on Camellia have not taken the key scheduling algorithm into account, in this paper we exploit the relations between the round subkeys of Camellia, together with some novel techniques in the key recovery process to improve the impossible differential attack on Camellia up to 12-round Camellia-128 and 16-round Camellia-256. The data complexities of the two attacks are 265 and 289 respectively, and the time complexities of the two attacks are less than 2(111.5) and 2(222.1) respectively. The presented results are better than any previously published cryptanalytic results on Camellia without the FL/FL-1 functions and whitening layers.
Content Type: 会议论文
URI: http://ir.iscas.ac.cn/handle/311060/8214
Appears in Collections:信息安全国家重点实验室_会议论文

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Recommended Citation:
Wu Wenling,Zhang Lei,Zhang Wentao. improved impossible differential cryptanalysis of reduced-round camellia[C]. 见:15th International Workshop on Selected Areas in Cryptography. Sackville, CANADA. AUG 14-15,.
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