Enhancing Digital Certificate Usability in Long Lifespan IoT Devices by Utilizing Private CA

Table 2

Details of IoT devices used during the test.

Corporate	A	B	C	D	E
IoT devices	Air conditioner	Air purifier	Controller	Camera	Plug
Issuer type	Private	Public	Public	Public	Public
Period of validity	24 years	2 years	2 years	1 year	1 year