Abstract
To protect copyrights of data from illegal copying, a scheme called recipient watermarking which can specify dishonest users who got the data legally and copied it illegally has been studied. A recipient watermarking consists of two processes, called coding process and embedding process. Even though there exists a secure embedding process on which it is impossible to erase the codeword by conspiracy of users, there are some cases that they can make the data by which the server cannot specify even one of them as a illegal user because of the defect of the coding process of the information about users.
In this paper, we propose a secure code for recipient watermarking against any conspiracy attacks including the attack by all users. The proposed code can specify two dishonest users who are in conspiracy and this code is more fair than such code proposed previously. We analyze the relation between probabilities to succeed attacks and conspiracy patterns, and show the security of our code.
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Watanabe, H., Kasami, T. (1997). A secure code for recipient watermarking against conspiracy attacks by all users. In: Han, Y., Okamoto, T., Qing, S. (eds) Information and Communications Security. ICICS 1997. Lecture Notes in Computer Science, vol 1334. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0028497
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DOI: https://doi.org/10.1007/BFb0028497
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