Distinguished Encoding Rules
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Fulll Title
Distinguished Encoding Rules (DER) we created to allow a centralized structure for digital representation of real-word entities such as entries in a telephone directory.
Context
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).