Hidehiko Nakagami

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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.(More)
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