Abstract
Camellia is one of the widely used block ciphers, which has been selected as an international standard by ISO/IEC. In this paper, by exploiting some interesting properties of the key-dependent layer, we improve previous results on impossible differential cryptanalysis of reduced-round Camellia and gain some new observations. First, we introduce some new 7-round impossible differentials of Camellia for weak keys. These weak keys that work for the impossible differential take 3/4 of the whole key space, therefore, we further get rid of the weak-key assumption and leverage the attacks on reduced-round Camellia to all keys by utilizing the multiplied method. Second, we build a set of differentials which contains at least one 8-round impossible differential of Camellia with two FL/FL− 1 layers. Following this new result, we show that the key-dependent transformations inserted in Camellia cannot resist impossible differential cryptanalysis effectively. Based on this set of differentials, we present a new cryptanalytic strategy to mount impossible differential attacks on reduced-round Camellia.
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Aoki, K., Ichikawa, T., Kanda, M., Matsui, M., Moriai, S., Nakajima, J., Tokita, T.: Camellia: A 128-Bit Block Cipher Suitable for Multiple Platforms - Design and Analysis. In: Stinson, D.R., Tavares, S. (eds.) SAC 2000. LNCS, vol. 2012, pp. 39–56. Springer, Heidelberg (2001)
Biham, E., Biryukov, A., Shamir, A.: Cryptanalysis of Skipjack Reduced to 31 Rounds Using Impossible Differentials. In: Stern, J. (ed.) EUROCRYPT 1999. LNCS, vol. 1592, pp. 12–23. Springer, Heidelberg (1999)
Chen, J., Jia, K., Yu, H., Wang, X.: New Impossible Differential Attacks of Reduced-Round Camellia-192 and Camellia-256. In: Parampalli, U., Hawkes, P. (eds.) ACISP 2011. LNCS, vol. 6812, pp. 16–33. Springer, Heidelberg (2011)
CRYPTREC-Cryptography Research and Evaluation Committees: report. Archive (2002), http://www.ipa.go.jp/security/enc/CRYPTREC/index-e.html
Hatano, Y., Sekine, H., Kaneko, T.: Higher order differential attack of Camellia (II). In: Nyberg, K., Heys, H.M. (eds.) SAC 2002. LNCS, vol. 2595, pp. 129–146. Springer, Heidelberg (2003)
International Standardization of Organization (ISO): International standard - ISO/IEC 18033-3. Tech. rep., Information technology - Security techniques - Encryption algrithm - Part 3: Block Ciphers (July 2005)
Knudsen, L.R.: DEAL - a 128-bit block cipher. Tech. rep., Department of Informatics, University of Bergen, Norway. technical report (1998)
Kühn, U.: Improved Cryptanalysis of MISTY1. In: Daemen, J., Rijmen, V. (eds.) FSE 2002. LNCS, vol. 2365, pp. 61–75. Springer, Heidelberg (2002)
Lee, S., Hong, S., Lee, S., Lim, J., Yoon, S.: Truncated Differential Cryptanalysis of Camellia. In: Kim, K.-c. (ed.) ICISC 2001. LNCS, vol. 2288, pp. 32–38. Springer, Heidelberg (2002)
Duo, L., Chao, L., Feng, K.: New Observation on Camellia. In: Preneel, B., Tavares, S. (eds.) SAC 2005. LNCS, vol. 3897, pp. 51–64. Springer, Heidelberg (2006)
Duo, L., Li, C., Feng, K.: Square Like Attack on Camellia. In: Qing, S., Imai, H., Wang, G. (eds.) ICICS 2007. LNCS, vol. 4861, pp. 269–283. Springer, Heidelberg (2007)
Li, L., Chen, J., Jia, K.: New Impossible Differential Cryptanalysis of Reduced-Round Camellia. In: Lin, D., Tsudik, G., Wang, X. (eds.) CANS 2011. LNCS, vol. 7092, pp. 26–39. Springer, Heidelberg (2011)
Li, L., Chen, J., Wang, X.: Security of Reduced-Round Camellia against Impossible Differential Attack. IACR Cryptology ePrint Archive 2011, 524 (2011)
’Liu, Y., Gu, D., Liu, Z., Li, W., Man, Y.: Improved Results on Impossible Differential Cryptanalysis of Reduced-Round Camellia-192/256. Journal of Systems and Software (accepted)
Lu, J., Dunkelman, O., Keller, N., Kim, J.-S.: New Impossible Differential Attacks on AES. In: Chowdhury, D.R., Rijmen, V., Das, A. (eds.) INDOCRYPT 2008. LNCS, vol. 5365, pp. 279–293. Springer, Heidelberg (2008)
Lu, J., Kim, J.-S., Keller, N., Dunkelman, O.: Improving the Efficiency of Impossible Differential Cryptanalysis of Reduced Camellia and MISTY1. In: Malkin, T. (ed.) CT-RSA 2008. LNCS, vol. 4964, pp. 370–386. Springer, Heidelberg (2008)
Lu, J., Wei, Y., Kim, J., Fouque, P.-A.: Cryptanalysis of Reduced Versions of the Camellia Block Cipher. In: Preproceeding of SAC (2011)
Lu, J., Wei, Y., Kim, J., Pasalic, E.: The Higher-Order Meet-in-the-Middle Attack and Its Application to the Camellia Block Cipher. In: Presented in Part at the First Asian Workshop on Symmetric Key Cryptography (ASK 2011) (August 2011), https://sites.google.com/site/jiqiang/
Mala, H., Shakiba, M., Dakhilalian, M., Bagherikaram, G.: New Results on Impossible Differential Cryptanalysis of Reduced–Round Camellia–128. In: Jacobson Jr., M.J., Rijmen, V., Safavi-Naini, R. (eds.) SAC 2009. LNCS, vol. 5867, pp. 281–294. Springer, Heidelberg (2009)
NESSIE: New European Schemes for Signatures, Integrity, and Encryption, final report of eurpean project IST-1999-12324. Archive (1999), http://www.cosic.esat.kuleuven.be/nessie/Bookv015.pdf
Shirai, T.: Differential, Linear, Boomerange and Rectangle Cryptanalysis of Reduced-Round Camellia. In: Proceedings of 3rd NESSIE Workshop, Munich, Germany, November 6-7 (2002)
Sugita, M., Kobara, K., Imai, H.: Security of Reduced Version of the Block Cipher Camellia against Truncated and Impossible Differential Cryptanalysis. In: Boyd, C. (ed.) ASIACRYPT 2001. LNCS, vol. 2248, pp. 193–207. Springer, Heidelberg (2001)
Wu, W., Feng, D., Chen, H.: Collision Attack and Pseudorandomness of Reduced-Round Camellia. In: Handschuh, H., Hasan, M.A. (eds.) SAC 2004. LNCS, vol. 3357, pp. 252–266. Springer, Heidelberg (2004)
Wu, W., Zhang, W., Feng, D.: Impossible Differential Cryptanalysis of Reduced-Round ARIA and Camellia. J. Comput. Sci. Technol. 22(3), 449–456 (2007)
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Liu, Y. et al. (2012). New Observations on Impossible Differential Cryptanalysis of Reduced-Round Camellia. In: Canteaut, A. (eds) Fast Software Encryption. FSE 2012. Lecture Notes in Computer Science, vol 7549. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-34047-5_6
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DOI: https://doi.org/10.1007/978-3-642-34047-5_6
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