Standards — Define the ASN.1 Language

ASN.1 and its encoding rules are defined by a set of international standards.

We recommend you obtain and use the official versions of the ASN.1 standards for reference. Links to the ITU-T recommendations are listed below. You can obtain the corresponding ISO/IEC standards from the International Organization for Standardization.

• ITU-T Recommendation X.697 (ISO/IEC 8825-8:2021)
  Information technology - ASN.1 Encoding Rules: Specification of Javascript Object Notation (JSON) Encoding Rules (JSON/ER)
• ITU-T Recommendation X.696 (ISO/IEC 8825-7:2021)
  Information technology - ASN.1 encoding rules: Specification of Octet Encoding Rules (OER)
• ITU-T Recommendation X.694 (ISO/IEC 8825-5:2021)
  Information technology - ASN.1 encoding rules: Mapping W3C XML schema definitions into ASN.1
• ITU-T Recommendation X.693 (ISO/IEC 8825-4:2021)
  Information technology - ASN.1 encoding rules: XML Encoding Rules (XER)
• ITU-T Recommendation X.692 (ISO/IEC 8825-3:2021)
  Information technology - ASN.1 Encoding Rules: Specification of Encoding Control Notation (ECN)
• ITU-T Recommendation X.691 (ISO/IEC 8825-2:2021)
  Information technology - ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)
• ITU-T Recommendation X.690 (ISO/IEC 8825-1:2021)
  Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)
• ITU-T Recommendation X.683 (ISO/IEC 8824-4:2021)
  Information technology - Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications
• ITU-T Recommendation X.682 (ISO/IEC 8824-3:2021)
  Information technology - Abstract Syntax Notation One (ASN.1): Constraint specification
• ITU-T Recommendation X.681 (ISO/IEC 8824-2:2021)
  Information technology - Abstract Syntax Notation One (ASN.1): Information object specification
• ITU-T Recommendation X.680 (ISO/IEC 8824-1:2021)
  Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation