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

Table 6

Memory overhead.

Schemes	Setup	KeyGen	Encrypt	Decrypt	Key update	Bytes
Fog-CPS scheme						1340
Odelu and Das [8]					N/A	1760
Guo et al. [6]					N/A	1636
Zhou et al. [9]					N/A	9876
Yamada et al. [14]					N/A	6292
Cheng et al. [12]					N/A	6932

Note: and : prime order pairing groups (160 bits); exp: exponent operation; : pairing operation; and : no. of attributes in secret key and access policy; : elliptic curve group defined over finite field ; : order of the base point (160 bits in ); : length of plaintext message .