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http://dx.doi.org/10.13089/JKIISC.2005.15.6.111

Period of Streamcipher Edon80  

Hong, Jin (National Security Research institute)
Park, Sang-Woo (National Security Research institute)
Abstract
The period of a recent streamcipher proposal Edon80 is analyzed. The designers of Edon80 had projected a period of $2^{103}$ Even though this could indeed be the average keystream Period, we show that for a randomly chosen key-IV pair, there exists a non-dismissible probability that the produced keystream will be of relatively short period. More explicitly, a keystream of period. $2^{55}$ may appear with probability $2^{-71}$, and one can show the existence of at least one key-lV pair producing a period $2^{11}$ keystream.
Keywords
Stream Cipher; Period; Eden80;
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  • Reference
1 S. Markovski, D. Gligoroski, L. Kocarev, 'Unbiased random sequences from quasigroup string transformations', FSE2005, LNCS 3557, pp. 163-180, Springer, 2005
2 D. Gligoroski, S. Markovski, L. Kocarev, M. Gusev, 'Edon80-Hardware synchronous stream cipher', eSTREAM, the ECRYPT Stream Cipher Project, Report 2005/007, 2005.http://www.ecrypt.org/stream/에서 찾을 수 있음