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Title:
A Chosen IV Attack Using Phase Shifting Equivalent Keys against DECIM v2
Authors: Hidehiko Nakagami, Ryoichi Teramura, Toshihiro Ohigashi, Hidenori Kuwakado, Masakatu Morii
Abstract:DECIM v2 is a stream cipher submitted to the ECRYPT stream cipher project (eSTREAM) and ISO/IEC 18033-4. No attack against DECIM v2 has been proposed yet. In this paper, we propose a chosen IV attack against DECIM v2 using a new equivalent key class. Our attack can recover an 80-bit key with a time complexity of 2^{79.90} when all bits of the IV are zero. This result is the best one on DECIM v2.
ePrint: https://eprint.iacr.org/2008/128
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