Distinguished Encoding Rules (DER)


DER Distinguished Encoding Rules is a key file format for cryptographic data.

It's the binary ASN.1 encoding of the data (not in plain text otherwise it's a PEM.

pem is the base64 encoded version of the DER formated data with additional header and footer lines to be transported via e.g. E-mail


To pem

to Privacy-Enhanced Mail (PEM) (OpenSsh key format)

openssl x509 –in file.der –inform DER –out file.pem –outform PEM

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