Deep dive into WS-Trust for enterprise identity. Learn about STS, token exchange, and secure SSO integration for modern B2B platforms.

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WS-Trust remains critical in enterprise environments despite being legacy technology. The protocol enables secure token exchange through Security Token Services (STS), bridging modern authentication systems with SOAP-based legacy infrastructure. Key concepts include Request Security Token (RST) and Response (RSTR) message flows, protocol translation between SAML and modern formats, and security best practices like TLS encryption, timestamp validation, and signature verification. While modern protocols like OIDC dominate new development, WS-Trust persists in healthcare, finance, and B2B supply chains where legacy systems can't be easily replaced. Hybrid approaches using gateways to wrap SOAP services are becoming standard practice.

Understanding WS-Trust: A Guide to Secure Token Exchange

What is WS-Trust and why we still use it?

The Role of the Security Token Service (STS)

Conclusion: The Future of Enterprise Token Exchange