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X.509 - Certificate format

Version (v1=0, v2=1, v3=2)
Serial number
Signature Algorithm ID
Issuer Name
Validity period
(Start and expiry date/time)
Subject Name
Subject public key info
Algorithm ID and public key value
Issuer Unique ID (optional)
Subject Unique ID (optional)
Extensions (optional)
Type - Critical/Non critical - Field value
Signature
Algorithm ID and signature value