2018 , Volume 23, № 3, p.77-80

Multiuser digital watermarking is a powerful tool for copyright protection of widely replicable digital products. This paper addresses Boneh-Shaw fingerprinting schemes. The algorithms proposed by D. Boneh and J. Shaw allow a distributor to detect any unauthorized copy and trace it back to user and they work correctly for any size of coalition. The main idea of this paper is a comparative analysis of two Boneh-Shaw digital watermarks schemes (cascade and basics), which makes clear which one of these schemes is more effective in terms of the length of the label. Using the comparative analysis and numerical experiments, we obtain the specific values of the boundaries for input parameters in which one scheme will be more efficient than another. From the results of the comparative analysis it can be concluded that for large number of users of the scheme and a small size of the coalition (in relation of users number) it is advisable to use the cascade scheme. In the case of a small number of users and a large size of the coalition (compared to the number of users) it is more expedient to use the basic scheme.