In this paper, we study the security of permutation based hash functions, i.e. blockcipher based hash functions with fixed keys. SMASH is such a hash function proposed by Knudsen in 2005 and broken the same year by Pramstaller et al. Here we show that the two tweaked versions, proposed soon after by Knudsen to thwart the attack, can also be attacked in collision in time O(n2). This time complex...

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A cosmic ray test system has been built to fully qualify the resistive plate chambers for the MUON system of the BESIII experiment. The setup has been designed to measure detector’s performance and to verify the stability and reliability of the MUON system. The same electronics, similar readout method and data analysis for BESIII MUON system have been used for this station. With this station, t...