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Digital Certificate- Formats & Types
Certificate Types
Extended Validated certificate
Organization Validated certificate
Domain Validated certificate
Certificate data formats
.der:
 binary encoding of x.509 certificate
.pem
 Not a certificate format, merely an encoding format
 base64 encoded of .der certificate.
 Characterized by BEGIN CERTIFICATE <content> END CERTIFICATE
 Usually used by open source Software
 container format (may contains keys, certificate, certificate signing request etc)
.key
 pem formatted file containing private key
 conventional format
.cert /.cer/ .crt
 pem formatted file with different extention
 recognized by Windows Explorer as a certificate
Inspect content of a certificate
 $ openssl x509 -in www_amazon_com.crt -text -noout
Types of Certificate
Certificate binds a public key to its owner.
PGP certificate
 Decentralized ways of establishing trust
X.509
 Centralized trust model
References
 https://serverfault.com/questions/9708/what-is-a-pem-
file-and-how-does-it-differ-from-other-openssl-
generated-key-file

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