• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.17 no.2
• /
• pp.73-81
• /
• 2007

We give two weaknesses of a recently proposed streamcipher MICKEY. We show time-memory-data tradeoff is applicable. We also show that the state update function reduces entropy of the internal state as it is iterated, resulting in keystreams that start out differently but become merged together towards the end.