Co-utility by Josep Domingo-Ferrer & David Sánchez

Author:Josep Domingo-Ferrer & David Sánchez
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

8 Simulation Results

This section presents a set of simulated experiments to illustrate the properties of the proposed system: buyer privacy, robustness against non-collaborative buyers and collusion resistance.

8.1 Buyer Privacy

In all simulations presented in this section, the recombined fingerprints were 4096-bit sequences divided into 128 segments of 32 bits each. The first simulation to confirm the results presented in Sect. 7.2.3 consisted of producing different generations of buyers using an exponential growth approach and checking the average number of correlation tests required to identify the buyers. The number of seed buyers was taken to be and each buyer could have between two and four parents which were chosen at random from all the previous generations (not only the immediately previous one). This means that the average number of parents per non-seed buyers was . The simulations shown in Table 1 were carried out, and a comparison of the average number of correlation tests with the expected fraction introduced in Sect. 7.2.3 is shown in Fig. 4.

The results in Table 1 show a single simulation and the average 100 simulations with 100 different seeds in the pseudo-random number generator in order to reduce the bias of the results. It can be seen that no significant differences appeared between 1 and 100 simulations. The last column represents the average percentage of buyers requiring backtracking in the 100 simulations. Not surprisingly, as the network (graph) became larger, more buyers required backtracking, but the percentage was always small.Table 1Average number and percentage of correlation tests on non-seed buyers in an exponentially growing population

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