Table 6 Computation complexity analysis of the protocol
Client side computations | Cloud computations | ||
|---|---|---|---|
Utility provider \(\mathcal {U}\) | S i1 | S ij | Â |
KeyGen - O(m+n+T) | – | – | Computeψ([F1],[Z1]) - O(n1m1T) |
MatrixTrans ψK(.) - O(n1m1+n1m2+n2m1+n2m2)=O(nm) | O(miT) | O(1) | Computeψ([F12],[Z2]) - O(n1m2T) |
Verify - O(n1T+n2T)=O(nT) | O(miT) | – | Computeψ([F12],[Z2]) - O(n2m1T) |
Unmask - O(n1T+n2T)=O(nT) | – | – | Computeψ([F2],[Z2]) - O(n2m2T) |
MatrixAdd - O(n1T+n2T)=O(nT) | – | – | Computeψ([H+],[Z]) -, O(nmT) |
Total client-side computation cost ≈O(nm+mT+nT) | Total cloud computation cost =O(nmT) | ||