Abstract
The stream cipher A2U2 proposed by David et al. [7] is one of lightweight cipher primitives. In this paper we present a real-time key recovery attack on A2U2 under the known-plaintext-attack model, which only needs at most 210 consecutive ciphertext bits and its corresponding plaintext with the time complexity about 224.7. Our result is much better than that of the attack proposed by M. Abdelraheem et al. in [9] whose complexity is O(249×C), where C is the complexity of solving a sparse quadratic equation system on 56 unknown key bits. Furthermore we provide a new approach to solving the above sparse quadratic equation system, which reduces the complexity C to a very small constant. Finally we do an entire experiment on a PC and recover all bits of a random key in a few seconds.
This work was supported by the Natural Science Foundation of China (Grant No. 60833008, 60902024, 61121062), the 973 Program (Grant No.2007CB807902, 2011CB302401) and Foundation of President of the Chinese Academy of Sciences (Grant No. 50Y24103900).
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Shi, Z., Feng, X., Feng, D., Wu, C. (2012). A Real-Time Key Recovery Attack on the Lightweight Stream Cipher A2U2. In: Pieprzyk, J., Sadeghi, AR., Manulis, M. (eds) Cryptology and Network Security. CANS 2012. Lecture Notes in Computer Science, vol 7712. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35404-5_2
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DOI: https://doi.org/10.1007/978-3-642-35404-5_2
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