TS ISO 17442-2

TS ISO 17442-2 is a financial services standard that defines how the Legal Entity Identifier (LEI) can be embedded in digital certificates. It builds on the LEI code format defined in ISO 17442-1 and applies it within the X.509 public key certificate structure, aligned with ISO/IEC 9594-8. In practical terms, it provides a standardised way to associate a certificate with a legal entity in a machine-readable and interoperable form.

The role of the LEI inside a digital certificate

The LEI is a globally standardised identifier used to distinguish legal entities involved in financial transactions. Placing the LEI in a digital certificate helps systems carry the organisation’s identity alongside its cryptographic credentials. This is useful in electronic authentication, corporate signing infrastructures, and trust frameworks where the same entity must be recognised consistently across different platforms.

What this part standardises

• The embedding of the ISO 17442-1 LEI code into a digital certificate using a standardised method
• A public key certificate structure conforming to ITU-T Recommendation X.509 and ISO/IEC 9594-8
• Interoperability for carrying legal entity identity in financial-services certificate environments

In general technical terms, X.509 certificates are a core building block of public key infrastructure, linking a public key to an identity. Adding the LEI to that structure supports more consistent organisation-level identification in secure communications and automated validation workflows. This standard focuses on how the LEI is used within the certificate format; it does not redefine the LEI system itself.