Security Measurement in Industrial IoT with Cloud Computing Perspective: Taxonomy, Issues, and Future Directions

Table 3

Number of papers in each classification.

Sections	Classification title	Number of papers	References
2.2	Storage-as-a-Service	Seven	[20–26]
2.3	Database-as-a-Service	Three	[5, 27, 28]
2.4	Information-as-a-Service	Five	[29–33]
2.5	Process-as-a-Service	Five	[10, 34–37]
2.6	Application-as-a-Service	Three	[38–40]
2.7	Platform-as-a-Service	Four	[41–44]
2.8	Integration-as-a-Service	Four	[45–48]
2.9	Security-as-a-Service	Ten	[49–58]
2.10	Management-as-a-Service	Eight	[2, 8, 59–64]
2.11	Testing-as-a-Service	Three	[10, 65, 66]
2.12	Infrastructure-as-a-Service	Four	[67–70]