Table 6.

Scalability of the proposed protocol for different numbers of data providers (9 features).

Data providers, n	Size of ciphertexts, MB	Iterations, n	Training time (computation)	Training time (transfer)	Evaluation time (computation)	Evaluation time (transfer)
3	60.0	45	4 min 16 seconds	3 min 13 seconds	9 min 54 seconds	10 min 33 seconds
5	100.0	45	6 min 26 seconds	3 min 13 seconds	15 min 24 seconds	10 min 39 seconds
10	200.0	45	12 min 45 seconds	3 min 12 seconds	30 min 42 seconds	10 min 51 seconds
15	300.0	45	19 min 5 seconds	3 min 13 seconds	45 min 54 seconds	11 min 3 seconds
20	400.0	45	25 min 52 seconds	3 min 13 seconds	61 min 13 seconds	11 min 17 seconds