DER encoded certificate

File Format
Name	DER encoded certificate
Ontology	Electronic File Formats Security DER encoded certificate ; ; ;
Extension(s)	.der, .crt, .cer
MIME Type(s)	application/x-x509-user-cert, application/x-x509-ca-cert

DER encoded certificate is a file format for storing an X.509 certificate.

It is one type of DER file. DER is a subset of BER format. BER is a serialization format for the abstract ASN.1 format.

Examples

To display the contents of a DER encoded certificate using OpenSSL:

 openssl x509 -noout -text -inform der -in example.der

To convert from DER encoded certificate format to PEM encoded certificate format:

 openssl x509 -in example.der -inform der -outform pem -out example.pem