Distinguished Encoding Rules

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Distinguished Encoding Rules (DER) we created to ASN.1 as a syntax for the digital representation of real-word entities such as entries in a telephone directory.


The rules were created by the ITU standard S.690 which defines BER, CER and DER. Only DER has seen broad adoption in the Public Key Infrastructure used for TSL and other certificates.

See the wiki page on Distinguished Name (DN).


  • This section describes a solution for Microsoft .NET 5.0 called pem-utils.
  • The code described was created by Wouter Huysentruit for .NET 4.7.1 (and NetStandard 2.0).
  • The revised code for .NET 5.0 in in the github repository https://github.com/TomCJones/pem-utils.