[2] DER (Distinguished Encoding Rules) は、 ASN.1 の符号化規則 (具象構文) の一種です。
[4] X.690 : Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) (tsbmail 著, 版) <http://www.itu.int/rec/T-REC-X.690-200811-I/en>
[5] RFC 7468 - Textual Encodings of PKIX, PKCS, and CMS Structures ( 版) <https://tools.ietf.org/html/rfc7468#appendix-B>