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Improved bounds on 2-frameproof codes with length 4

机译:改进了长度为4的2帧验证码的边界

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摘要

Frameproof codes (FPCs) are widely studied as they are classic fingerprinting codes that can protect copyrighted materials. The main interests are construction methods and bounds of the number of codewords of FPCs for a fixed length when the alphabet size approaches infinity. In this paper, we focus on the upper bound of the size of FPCs when the fixed length is 4 and the strength is 2. We obtain an upper bound 2q2-2q+7 on the size of a q-ary 2-FPC of length 4 for any positive integer q48. The best previously well known bound of this type of FPCs is 2q2-2, which is due to Blackburn (SIAM J Discret Math 16:499-510, 2003). Our new upper bound improves the previous upper bound and it is not very far from the current best lower bound 2q2-4q+3 obtained from the explicit construction due to Chee and Zhang (IEEE Trans Inf Theory 58:5449-5453, 2012).
机译:框架验证码(FPC)是可以保护受版权保护的材料的经典指纹编码,因此已得到广泛研究。主要兴趣是当字母大小接近无穷大时,固定长度的FPC的代码字数量的构造方法和界限。在本文中,我们关注固定长度为4且强度为2时FPC尺寸的上限。我们获得长度为q元2-FPC的尺寸的上限2q2-2q + 7 4对于任何正整数q> 48。这种类型的FPC的最广为人知的界限是2q2-2,这是由于布莱克本(SIAM J Discret Math 16:499-510,2003)。由于Chee和Zhang(IEEE Trans Inf Theory 58:5449-5453,2012),我们的新上限改进了先前的上限,并且与从显式构造中获得的当前最佳下限2q2-4q + 3相差不远。

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