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What (who) is Canonical Encoding Rules - definition

INTERFACE DESCRIPTION LANGUAGE FOR DEFINING DATA STRUCTURES THAT CAN BE SERIALIZED AND DESERIALIZED IN A STANDARD, CROSS-PLATFORM WAY

Abstract Syntax Notation One; X.208; X.680; Packed Encoding Rules; ASN1; Abstract Syntax Notation 1; Abstract Syntax Notation; Abstract syntax notation; Abstract syntax notation one; Packed encoding rules; XML Encoding Rules; XML encoding rules; Xml encoding rules; Xml Encoding Rules; Xer encoding rules; XER encoding rules; XER Encoding Rules; Xer Encoding Rules; Xml Encoding rules; XML Encoding rules; PER encoding rules; PER Encoding Rules; Per Encoding Rules; Per encoding rules; Generic String Encoding Rules; Generic string encoding rules; Generic String encoding rules; Generic string Encoding Rules; GSER Encoding Rules; GSER encoding rules; Gser encoding rules; Gser Encoding Rules; CXER; Cxer; Canonical XML Encoding Rules; Canonical XML encoding rules; Canonical Xml encoding rules; Canonical xml encoding rules; Canonical Xml Encoding Rules; Asn.1; Extension root; Asn1; Abstract Syntax Notation 1x; Octet encoding rules; JSON encoding rules

Canonical Encoding Rules

ITU-T RECOMMENDATION

Basic Encoding Rules; Canonical Encoding Rules; Distinguished Encoding Rules; Distinguished Encoding Rule; X.209; Basic encoding rules; Distinguished encoding rules; Canonical encoding rules; CER encoding rules; CER Encoding Rules; Ber encoding rules; Ber Encoding Rules; BER Encoding Rules; BER encoding rules

<protocol, standard> (CER) A restricted variant of BER for producing unequivocal transfer syntax for data structures described by ASN.1. Whereas BER gives choices as to how data values may be encoded, CER and DER select just one encoding from those allowed by the basic encoding rules, eliminating all of the options. They are useful when the encodings must be preserved, e.g. in security exchanges. CER and DER differ in the set of restrictions that they place on the encoder. The basic difference between CER and DER is that DER uses definitive length form and CER uses indefinite length form. Documents: ITU-T X.690, ISO 8825-1. See also PER. (1998-05-19)

X.209

ITU-T RECOMMENDATION

Basic Encoding Rules; Canonical Encoding Rules; Distinguished Encoding Rules; Distinguished Encoding Rule; X.209; Basic encoding rules; Distinguished encoding rules; Canonical encoding rules; CER encoding rules; CER Encoding Rules; Ber encoding rules; Ber Encoding Rules; BER Encoding Rules; BER encoding rules

Basic Encoding Rules

Basic Encoding Rules

ITU-T RECOMMENDATION

Basic Encoding Rules; Canonical Encoding Rules; Distinguished Encoding Rules; Distinguished Encoding Rule; X.209; Basic encoding rules; Distinguished encoding rules; Canonical encoding rules; CER encoding rules; CER Encoding Rules; Ber encoding rules; Ber Encoding Rules; BER Encoding Rules; BER encoding rules

<protocol, standard> (BER) ASN.1 encoding rules for producing self-identifying and self-delimiting {transfer syntax} for data structures described in ASN.1 notations. BER is an self-identifying and self-delimiting encoding scheme, which means that each data value can be identified, extracted and decoded individually. Huw Rogers once described BER as "a triumph of bloated theory over clean implementation". He also criticises it as designed around bitstreams with arbitrary boundaries between data which can only be determined at a high level. Documents: ITU-T X.690, ISO 8825-1. See also CER, DER, PER. (1998-05-28)

Wikipedia

ASN.1

Abstract Syntax Notation One (ASN.1) is a standard interface description language for defining data structures that can be serialized and deserialized in a cross-platform way. It is broadly used in telecommunications and computer networking, and especially in cryptography.

Protocol developers define data structures in ASN.1 modules, which are generally a section of a broader standards document written in the ASN.1 language. The advantage is that the ASN.1 description of the data encoding is independent of a particular computer or programming language. Because ASN.1 is both human-readable and machine-readable, an ASN.1 compiler can compile modules into libraries of code, codecs, that decode or encode the data structures. Some ASN.1 compilers can produce code to encode or decode several encodings, e.g. packed, BER or XML.

ASN.1 is a joint standard of the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) in ITU-T Study Group 17 and ISO/IEC, originally defined in 1984 as part of CCITT X.409:1984. In 1988, ASN.1 moved to its own standard, X.208, due to wide applicability. The substantially revised 1995 version is covered by the X.680 series. The latest revision of the X.680 series of recommendations is the 6.0 Edition, published in 2021.

https://en.wikipedia.org/wiki/ASN.1