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

Table 3

Contents of the certificate which can be imitated.

Field of certificates	Can be imitated/manipulated?
Version	Yes
Serial number	Yes
Signature algorithm	Yes
Issuer	Yes
Validity	Yes
Subject	Yes
Subject public key info	Partially (except the public key information)
X.509v3 extensions	Almost everything (except the fields that require a secret key or CA certificate information)
CT precertificate timestamp	No