Distinguished Encoding Rules (DER)

1 - About

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

It's the binary ASN.1 encoding of the data.

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

3 - Management

3.1 - 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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