Common use of Computational Cost Clause in Contracts

Computational Cost. As can be seen from the Table 1 and Figure 4, there is a huge advantage in computation costs. With respect to computation costs, the hash operation is the most efficient operation, compared to elliptic curve multiplication, elliptic curve addition or encryption. Table 1 Comparison of the computation costs. (Tm=Time for EC point multiplication, Ta=Time for EC point addition, Ts=Time for encryption, Th= Time for hash operation Entity [36] This Device MEC TTP 7Tm + 2Ta + 2Ts + 12Th 2Th 7Tm + 2Ta + 2Ts + 13Th 2Th 9Tm + 4Ta + 4Ts + 13Th 3Th By using the average computational time in [35] for different cryptographic operations in different devices, we compare the average computation time in a practical implementation. Here we assume Zolertia RE-▇▇▇▇ as the MIoT node, Raspberry PI3B+ as the MEC node and PC Intel Core i7-8750HCPU as the TTP or the cloud. As can be seen from Figure 4, the proposed solution has a significant performance advantage over the system proposed in [36].

Computational Cost. As can be seen from the Table 1 and Figure 4, there is a huge advantage in computation costs. With respect to computation costs, the hash operation is the most efficient operation, compared to elliptic curve multiplication, elliptic curve addition or encryption. Table 1 Comparison of the computation costs. (Tm=Time for EC point multiplication, Ta=Time for EC point addition, Ts=Time for encryption, Th= Time for hash operation Entity [36] This Device MEC TTP 7Tm + 2Ta + 2Ts + 12Th 2Th 7Tm ▇▇▇▇ ▇▇▇ ▇▇▇ + 2Ta + 2Ts + 13Th 2Th 9Tm ▇▇▇▇ ▇▇▇ ▇▇▇ + 4Ta + 4Ts + 13Th 3Th By using the average computational time in [35] for different cryptographic operations in different devices, we compare the average computation time in a practical implementation. Here we assume Zolertia RE-▇▇▇▇ as the MIoT node, Raspberry PI3B+ as the MEC node and PC Intel Core i7-8750HCPU as the TTP or the cloud. As can be seen from Figure 4, the proposed solution has a significant performance advantage over the system proposed in [36].