An Autonomous Log Storage Management Protocol with Blockchain Mechanism and Access Control for the Internet of Things

. 2020 Nov 12;20(22):6471. doi: 10.3390/s20226471

Algorithm 9: Log unsigncryption.

Input:

C T, S K_{I D_{i}}, P P

.
Output:

M

1:
Restores $w_{i}$ from $m_{e}$ with appropriate attributes: $[\begin{matrix} 1 \\ 0 \\ \begin{matrix} ⋮ \\ 0 \end{matrix} \end{matrix}] = m_{e} w_{j}$ .
2:
Use $C, C^{'}, D_{j}$ and $S K_{I D_{i}}$ to compute decryption key: $Y^{s} = e {(g, g)}^{s α} = \frac{e (C^{'}, K^{i})}{Π_{j \in x} {(e (C_{j}, L^{i}) e (D_{j} K_{j}^{i}))}^{w_{j}}}$ .
3:
Compute $h = H (C)$ .
4:
Use $g$ , $Y$ , $C$ and $C^{'}$ to $Ve r i f y : e (h, Y_{. x} C^{'}) ≟ e (σ_{C T}, g)$ .
5:
if above check holds, then continue with step 7.
6:
otherwise, terminate the session.
7:
Use $Y^{s}$ to decrypt $C$ and obtain $M = C . Y^{s}^{- 1}$ .