EPPDA: An Efficient and Privacy-Preserving Data Aggregation Scheme with Authentication and Authorization for IoT-Based Healthcare Applications

Table 3

Computation complexity of the proposed EPPDA scheme.

Entity name	Involving operations	Computation complexity
Medical sensors	(1) Crypt his health data; (2) Generate the MAC; (3) Generates the signature of verification the medical sensor at the aggregator
Aggregator	(1) Verify the legitimacy of the medical sensors; (2) Generates an aggregated cipher text; (3) Generates an aggregated MACagg; (4) Generates the signature of verification the aggregator at the medical server	()
Medical server	(1) Verify the legitimacy of the aggregator; (2) Aggregated data integrity verification; (3) Data decryption