完全安全码是不存在的,这已经从理论上得到证明。也就是说,任何安全码在某一种情况下,对叛逆者的追踪必定失败。有一种追踪效率很高的2—安全码,当然它在某种特殊情况下也无法实现对叛逆者的追踪。文中改进了该算法,使得追踪效率更高。而且通过Hash函数实现在这种特殊情况下对叛逆者的追踪,因此,可以实现对每个盗版码字的追踪。 The complete security code does not exist, which has been proved theoretically. In other words, any security code in any case, tracking the traitor must fail. There is a very efficient 2-way code tracking, of course, it can not be achieved in some special cases of tracking traitors. The paper improves the algorithm, making tracking more efficient. But also through the Hash function tracking traitors in this special case, so you can achieve the tracking of each pirate codeword.