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Known Traveller Digital Identity (KTDI) Summary

Core Content

The Known Traveller Digital Identity (KTDI) initiative, introduced by the World Economic Forum (WEF) in January 2018, is a collaborative effort between public and private sector partners to enhance the security and seamless experience of cross-border travel through the use of decentralized identity (SSI) technologies. The goal is to create a globally accepted, interoperable identity ecosystem that supports secure and efficient travel processes.

KTDI is built on the W3C verifiable credentials (VC) and decentralized identifiers (DID) standards, which enable individuals to self-manage their digital identity attributes, such as passport details or bank information. These attributes are attested by issuing authorities and can be selectively disclosed or verified using zero-knowledge proofs (ZKP) to ensure privacy and security.

The solution is structured into four layers of the decentralized identity model:

1. Layer 1: DID Networks – The foundational layer, including blockchain and DID overlay, where public identities are rooted and credentials are issued.
2. Layer 2: DID Communication (DIDComm) Protocol – A secure, encrypted messaging framework enabling peer-to-peer interactions between agents and verifiers.
3. Layer 3: Credential Exchange – The layer where issuers issue credentials, holders present proofs, and verifiers validate them using the ledger.
4. Layer 4: Governance Frameworks – A business-focused layer that defines trust mechanisms, legal agreements, and regulatory compliance. It is not covered in this document.

Main Views

• Decentralized Identity: KTDI is based on self-sovereign identity (SSI), where individuals have ownership and control over their identity data.
• Interoperability: The initiative aims for global interoperability by using open standards, open specifications, and industry best practices.
• Pilot Implementation: A real-world pilot between the Netherlands and Canada is testing the policies, processes, and technologies of the KTDI concept.
• Collaboration: The success of KTDI depends on multistakeholder collaboration among governments, airlines, airports, technology providers, and regulatory bodies.
• Technology Choice: While blockchain is a key enabler, the KTDI concept remains open to other technologies and approaches that align with its core principles.

Key Information

• Key Technologies:

  • Blockchain – Provides a secure and transparent platform for credential issuance and revocation.
  • DID – Enables unique, decentralized identifiers for individuals and entities.
  • Verifiable Credentials (VCs) – Standardized digital credentials that can be verified without revealing additional personal information.
  • Zero-Knowledge Proofs (ZKPs) – Allow for privacy-preserving verification of identity claims.
  • DID Communication (DIDComm) – A secure messaging protocol for decentralized identity interactions.

• Pilot Group:

  • Includes WEF, Netherlands and Canada governments, KLM Royal Dutch Airlines, Air Canada, Amsterdam Airport Schiphol, Greater Toronto Airport Authority, Aéroports de Montréal, Accenture, Vision Box, and Idemia.
  • The pilot tests governance, privacy, security frameworks, and technology integration in a real-world cross-border setting.

• Standards and Specifications:

  • The KTDI solution relies on W3C standards, including VC data model, DID standards, and DIDComm protocol.
  • ISO standards related to blockchain, security, privacy, and governance are also referenced and considered.
  • The document emphasizes the importance of continuous monitoring and adapting to new developments in decentralized identity.

• Challenges and Considerations:

  • Privacy and Security: The KTDI concept must balance individual privacy with security requirements.
  • Interoperability: The use of international standards is crucial to ensure cross-border compatibility.
  • Governance: A governance framework is necessary to define trust mechanisms, legal agreements, and regulatory compliance.
  • Technological Flexibility: The solution is not limited to blockchain, and alternative or complementary technologies may be used in the future.

• Future Goals:

  • To scale and adopt the KTDI concept globally.
  • To support multiple use cases, geographies, and technologies in future pilots.
  • To foster a global ecosystem of interoperable digital identities that can be used across the travel and tourism industry.

Conclusion

This White Paper outlines the technical foundation, standards, and best practices that have shaped the KTDI concept and its pilot. It serves as a guide for future development, implementation, and collaboration to achieve global interoperability in travel identity management. The WEF encourages feedback and proposals from all stakeholders to further enhance and complement the KTDI initiative.