. 2016 Sep 10;16(9):1463. doi: 10.3390/s16091463

Table 4.

Comparison of the computational overhead. BAAS, basic average aggregation scheme; WAAS, weighted average aggregation scheme; PAAS, privacy-enhanced aggregation scheme; MU, mobile user; CS, cloud server; TA, trusted authority.

	MU	SP	CSs	TA
BAAS	$2 T_{e x p} + T_{m u l}$	N/A	$(l + 1) T_{e x p} + (k + l - 1) T_{m u l} + T_{p o l}$	N/A
WAAS	$2 T_{e x p} + T_{m u l}$	N/A	$(l + 1) T_{e x p} + (k + l - 1) T_{m u l} + k T_{b i m} + T_{p o l}$	$2 k T_{e x p} + k T_{m u l}$
PAAS	$6 T_{e x p} + 3 T_{m u l} + 2 T_{b i m}$	N/A	$2 (l + 1) T_{e x p} + 2 (k + l - 1) T_{m u l} + 2 T_{p o l}$	N/A
${MHDA}^{+}$ [6]	$2 T_{e x p} + T_{m u l}$	$(k - 1) T_{m u l}$	$(l + 1) T_{e x p} + l T_{m u l} + T_{p o l}$	N/A