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A Chosen IV Attack Using Phase Shifting Equivalent Keys against DECIM v2
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| 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. |
BibTeX
@misc{eprint-2008-17805,
title={A Chosen IV Attack Using Phase Shifting Equivalent Keys against DECIM v2},
booktitle={IACR Eprint archive},
keywords={secret-key cryptography / cryptanalysis, equivalent keys, stream cipher, DECIM v2, eSTREAM},
url={http://eprint.iacr.org/2008/128},
note={ mmorii@kobe-u.ac.jp 13985 received 21 Mar 2008, last revised 16 Apr 2008},
author={Hidehiko Nakagami and Ryoichi Teramura and Toshihiro Ohigashi and Hidenori Kuwakado and Masakatu Morii},
year=2008
}