Foreword

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This document was prepared by joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 31, Automatic identification and data capture techniques.

This second edition cancels and replaces the first edition (ISO/IEC 20248:2018), which has been technically revised.

The main changes are as follows:

— The relationship between the Domain Authority (data owner) and the Domain Authority ID (DAID) is clarified to be one-to-many. The DAID has been extended to cater for the GS1 Company Prefix longer than 10 digits (see 7.5.3), and a method to use the primary data carrier DAID, if present (see 7.5.2).
— The data types and specifications have been updated for easier implementation and completeness, especially to support the practice of using the data type specifications to achieve optimized schema-based data encoding. A codebook method forms part of this update.
— The date field type has been found to be limiting. A new human readable isodate has been specified to replace date (see 8.9.3.7).
— The format of binary data is explicitly defined to be HexString or Base64String ensuring interoperability and ease of use.
— The bstring DDDdata has been limited to HexString since Base64 decoding can be done in more than one way which may cause a valid DigSig to be rejected.
— The digsigenv type has been changed from bstring to string with a range of Base64String, which is technically the same, but explicit and clear.
— The cidsniptext pragma (field directive) has been removed since it is not practical, not used, and redundant. It is also difficult and convoluted to use and implement.
— ISO/IEC 9899 , Information technology — Programming languages — C has been removed as a normative reference. Common current coding language methods replaced the C methods.
— Example cryptography methods are provided in B.4.
— Example interfaces to potential code blocks are provided in D.3.3 and E.3.3.
— Revocation has been harmonized with conventional best practices. The CID requirement to be 0 and 1 has been removed (see Annex J).
— An example implementation architecture description has been added as Annex N.
— The structured document function (see 8.11) has been enhanced to support multiple languages. An example structured document is discussed as Annex O.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-committees.

BS ISO/IEC 20248:2022

Information technology. Automatic identification and data capture techniques. Digital signature data structure schema

Current, Under Review

Published:

31 Aug 2022