ITU-T X.690-2015
Information technology – ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) (Study Group 17)

Standard No.

ITU-T X.690-2015

Release Date

2015

Published By

International Telecommunication Union (ITU)

Latest

ITU-T X.690-2015

Scope

Recommendation ITU-T X.690 | ISO/IEC 8825-1 defines a set of Basic Encoding Rules (BER) that may be applied to values of types defined using the ASN.1 notation. Application of these encoding rules produces a transfer syntax for such values. It is implicit in the specification of these encoding rules that they are also used for decoding. This Recommendation | International Standard defines also a set of Distinguished Encoding Rules (DER) and a set of Canonical Encoding Rules (CER) both of which provide constraints on the Basic Encoding Rules (BER). The key difference between them is that DER uses the definite length form of encoding while CER uses the indefinite length form. DER is more suitable for the small encoded values, while CER is more suitable for the large ones. It is implicit in the specification of these encoding rules that they are also used for decoding.

ITU-T X.690-2015 Referenced Document

• ISO/IEC 13712-1:1995 Information technology - Remote operations: Concepts, model and notation
• ISO/IEC 13712-2:1995 Information technology - Remote operations - Part 2: OSI realizations - Remote Operations Service Element (ROSE) service definition
• ISO/IEC 8824-1:1998 Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation
• ISO/IEC 8824-3:1998 Information technology - Abstract Syntax Notation One (ASN.1): Constraint specification
• ISO/IEC 8825-1:1998 Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)
• ISO/IEC 8825-2:1998 Information technology - ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)
• ITU-T X.682-1997 Information Technology - Abstract Syntax Notation One (ASN.1): Constraint Specification - Series X: Data Networks and Open System Communications OSI Networking and System Aspects - Abstract Syntax - Notation One (ASN.1)
• ITU-T X.690-1997 Information Technology - ASN.1 Encoding Rules: Specification of Basic Encoding Rules (BER)@ Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) - Series X: Data Networks and Open System Communications OSI Networking and System Aspects -
• ITU-T X.691-1997 Information Technology - ASN.1 Encoding Rules - Specification of Packed Encoding Rules (PER) - Series X: Data Networks and Open System Communications OSI Networking and System Aspects - Abstract Syntax Notation One (ASN.1)
• ITU-T X.880-1994 Information Technology - Remote Operations: Concepts Model and Notation - Data Networks and Open System Communications OSI Applications - Remote Operations 44 pp
• ITU-T X.881-1994 Information Technology - Remote Operations: OSI Realizations - Remote Operations Service Element (Rose) Service Definition - Data Networks and Open System Communications OSI Applications - Remote Operations Amendment 1: Mapping to A-Unit-Data and Built-in

ITU-T X.690-2015 history

• 2015 ITU-T X.690-2015 Information technology – ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) (Study Group 17)
• 2011 ITU-T X.690 CORR 1-2011 Information technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER) Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) Technical Corrigendum 1 Study Group 17
• 2008 ITU-T X.690-2008 Information technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER) Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) Study Group 17