The Prediction of Serial Number in OpenSSL’s X.509 Certificate

Table 2

The data structure of X.509 certificates.

field	comments	example
X.509 version number	Standard X.509	Version 3
Serial number	Chosen by CA	0x01000001
Signature algorithm identifier	Standard X.509	MD5withRSAEncryption
Issuer distinguished name	Identity of CA	CN=“xxx CA”
		L=“xxxxx”
		C=“xx”
Not valid before	Controlled by CA	Jan.1,2017,00h00m01s
Not valid after	Controlled by CA	Dec.31,2017,23h59m59s
Subject distinguished name	Identity of users	CN=“xxxxx”
		O=“xxxx”
		L=“xxx”
		C=“xx”
Public key algorithm	Standard X.509	RSAEncryption
Subject public key info	Controlled by users	0x98765432…
Version 3 extensions	Standard X.509	…