NZS ISO/IEC 39794.1:2025
Information technology – Extensible biometric data interchange formats – Part 1: Framework
This standard sets out the rules and guidelines for defining biometric data formats that can evolve without breaking compatibility. It specifies common data elements and structures for both binary (ASN.1) and textual (XML) formats and introduces conformance testing methodologies for syntactic validation of biometric data blocks.
This standard was considered for adoption by the P4830 Identical Adoption of Digital Standards Committee which included experts from government, industry, academia, and the private sector, all focused on the responsible use of emerging technologies.
This standard is identical to and has been reproduced from ISO/IEC 39794-1:2019, Information technology – Extensible biometric data interchange formats verification services, Part 1: Framework.
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NZS ISO/IEC 39794.1 2025
Committee representation
Acknowledgement
Copyright
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Conformance
6 General biometric system
6.1 Conceptual representation of general biometric system
6.2 Conceptual components of a general biometric system
6.2.1 Data capture subsystem
6.2.2 Transmission subsystem
6.2.3 Signal processing subsystem
6.2.4 Data storage subsystem
6.2.5 Comparison subsystem
6.2.6 Decision subsystem
6.2.7 Administration subsystem
6.2.8 Interface
6.3 Functions of general biometric system
6.3.1 Enrolment
6.3.2 Verification
6.3.3 Identification
7 Rules and guidelines
7.1 Capture date and time
7.2 Degree of processing
7.2.1 Overview
7.2.2 Captured biometric sample
7.2.3 Intermediate biometric sample
7.2.4 Biometric feature set
7.3 Relationship to CBEFF
7.3.1 Overview
7.3.2 BDB format owner and format identifiers
7.4 Types of extensible biometric data interchange formats
7.5 Criteria for standardizing biometric data interchange formats
7.6 Extensibility
7.7 Naming conventions for biometric data interchange formats
7.8 Treatment of multi-biometric data
7.9 Capture conditions
7.10 Capture device requirements
7.11 Quality requirements for biometric data
7.12 Biometric feature extraction algorithms
7.13 Biometric feature comparison algorithms
7.14 Identifiers for resources related to the ISO/IEC 39794 series
8 Abstract data elements
8.1 General
8.2 Version block
8.3 Representation block
8.3.1 Capture device block
8.3.2 Capture date/time block
8.3.3 Quality blocks
8.3.4 PAD data block
8.3.5 Extended data blocks
9 Tagged binary encoding scheme
9.1 General
9.2 Naming conventions for ASN.1 modules in the ISO/IEC 39794 series
9.2.1 ASN.1 module names
9.2.2 Object identifier for ASN.1 modules
9.2.3 Type and component names
9.3 Prototypes
9.4 Abstract syntax of common data types for the ISO/IEC 39794 series, in ASN.1
9.5 Abstract syntax of general BDB, in ASN.1
9.6 Definition extension in ASN.1
9.6.1 General
9.6.2 Addition of components to sequence types
9.6.3 Addition of components to choice types
9.6.4 Extension of an enumerated type with a new value
10 XML encoding scheme
10.1 General
10.2 Structure of XML schema definitions
10.3 Naming conventions for XML schema definitions in the ISO/IEC 39794 series
10.3.1 XML namespace names
10.3.2 Type and element names
10.4 Prototypes
10.5 XML schema definition of common data types for the ISO/IEC 39794 series
10.6 Definition extension in XML
10.6.1 General
10.6.2 Extending XML simple types
10.6.3 Extending XML sequence types
10.6.4 Extending XML choice types
10.6.5 Extending XML enumerations
Annex A (normative) Formal specifications of common data types for the ISO/IEC 39794 series
Annex B (normative) Abstract syntax of general tagged binary BDB in ASN.1
Annex C (normative) Conformance testing methodology
Annex D (informative) Examples of comparison scenarios
Bibliography
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NZS ISO/IEC 39794.1 2025
Committee representation
Acknowledgement
Copyright
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Conformance
6 General biometric system
6.1 Conceptual representation of general biometric system
6.2 Conceptual components of a general biometric system
6.2.1 Data capture subsystem
6.2.2 Transmission subsystem
6.2.3 Signal processing subsystem
6.2.4 Data storage subsystem
6.2.5 Comparison subsystem
6.2.6 Decision subsystem
6.2.7 Administration subsystem
6.2.8 Interface
6.3 Functions of general biometric system
6.3.1 Enrolment
6.3.2 Verification
6.3.3 Identification
7 Rules and guidelines
7.1 Capture date and time
7.2 Degree of processing
7.2.1 Overview
7.2.2 Captured biometric sample
7.2.3 Intermediate biometric sample
7.2.4 Biometric feature set
7.3 Relationship to CBEFF
7.3.1 Overview
7.3.2 BDB format owner and format identifiers
7.4 Types of extensible biometric data interchange formats
7.5 Criteria for standardizing biometric data interchange formats
7.6 Extensibility
7.7 Naming conventions for biometric data interchange formats
7.8 Treatment of multi-biometric data
7.9 Capture conditions
7.10 Capture device requirements
7.11 Quality requirements for biometric data
7.12 Biometric feature extraction algorithms
7.13 Biometric feature comparison algorithms
7.14 Identifiers for resources related to the ISO/IEC 39794 series
8 Abstract data elements
8.1 General
8.2 Version block
8.3 Representation block
8.3.1 Capture device block
8.3.2 Capture date/time block
8.3.3 Quality blocks
8.3.4 PAD data block
8.3.5 Extended data blocks
9 Tagged binary encoding scheme
9.1 General
9.2 Naming conventions for ASN.1 modules in the ISO/IEC 39794 series
9.2.1 ASN.1 module names
9.2.2 Object identifier for ASN.1 modules
9.2.3 Type and component names
9.3 Prototypes
9.4 Abstract syntax of common data types for the ISO/IEC 39794 series, in ASN.1
9.5 Abstract syntax of general BDB, in ASN.1
9.6 Definition extension in ASN.1
9.6.1 General
9.6.2 Addition of components to sequence types
9.6.3 Addition of components to choice types
9.6.4 Extension of an enumerated type with a new value
10 XML encoding scheme
10.1 General
10.2 Structure of XML schema definitions
10.3 Naming conventions for XML schema definitions in the ISO/IEC 39794 series
10.3.1 XML namespace names
10.3.2 Type and element names
10.4 Prototypes
10.5 XML schema definition of common data types for the ISO/IEC 39794 series
10.6 Definition extension in XML
10.6.1 General
10.6.2 Extending XML simple types
10.6.3 Extending XML sequence types
10.6.4 Extending XML choice types
10.6.5 Extending XML enumerations
Annex A (normative) Formal specifications of common data types for the ISO/IEC 39794 series
Annex B (normative) Abstract syntax of general tagged binary BDB in ASN.1
Annex C (normative) Conformance testing methodology
Annex D (informative) Examples of comparison scenarios
Bibliography
NZS ISO/IEC 39794.1:2025
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.