A Lightweight Attribute-Based Security Scheme for Fog-Enabled Cyber Physical Systems

Algorithm 4

Partial key pair update.

1: Input: Secret set.

2: Output: New partial key pair .

3: Increment the counter for revoked keys.

4: If the attributes are the same, the previous computations over attributes are considered.

5: Else, perform calculations for attributes from to .

6: Map attribute in to using Equation (1) and compute secret number .

7: Next, compute using Equation (3).

8: Next, compute public key component for attribute using Equation (4).