Build an API Gateway for Adaptive Friction with Envoy & WASM

Adaptive Friction ExplainedImplement dynamic security policies that adjust verification steps based on real-time risk signals, optimizing both user experience and fraud prevention.

Envoy & WASM SynergyLeverage Envoy Proxy for robust traffic management and WebAssembly (WASM) for highly performant, portable, and extensible custom logic within your API Gateway.

Real-time Policy EnforcementAchieve instantaneous decision-making at the edge, allowing for granular control over access and verification flows without impacting backend services.

Didit's Role in Identity OrchestrationIntegrate Didit's AI-native identity verification suite, including ID Verification and Liveness Detection, directly into your gateway for seamless, compliant, and fraud-resistant user journeys.

The Need for Adaptive Friction in Modern API Gateways

In today's digital landscape, balancing user experience with robust security is paramount. Traditional, static security measures often lead to either over-friction for legitimate users or insufficient protection against sophisticated threats. This is where the concept of 'adaptive friction' comes into play. Adaptive friction involves dynamically adjusting the level of security and verification required based on real-time risk assessment. For instance, a low-risk user might experience a seamless login, while a high-risk transaction or an unknown device might trigger additional identity verification steps, such as a biometric scan or document check.

An API Gateway is the ideal place to implement such adaptive policies. It acts as the single entry point for all API traffic, providing a central control plane for authentication, authorization, rate limiting, and, crucially, dynamic policy enforcement. By integrating intelligence at this layer, organizations can create a more secure yet user-friendly experience.

Envoy Proxy as the Foundation for Your API Gateway

Envoy Proxy has emerged as a leading choice for building modern API Gateways and service meshes. Developed by Lyft and now a Cloud Native Computing Foundation (CNCF) project, Envoy is a high-performance, open-source edge and service proxy. Its key features include:

• High Performance: Built in C++, Envoy is designed for speed and efficiency.
• Extensibility: A rich filter chain mechanism allows for custom logic to be inserted at various points in the request lifecycle.
• Observability: Provides extensive metrics, logging, and tracing capabilities out-of-the-box.
• Dynamic Configuration: Supports dynamic updates via xDS APIs, enabling configuration changes without downtime.

These capabilities make Envoy an excellent choice for an API Gateway that needs to handle complex routing, traffic management, and security policies. However, for truly adaptive friction, we need a way to inject custom, application-specific logic that can react to real-time signals without recompiling or restarting the proxy.

WebAssembly (WASM) for Custom, Portable Logic at the Edge

This is where WebAssembly (WASM) becomes a game-changer for API Gateways. WASM provides a safe, portable, and high-performance binary instruction format for executables. It allows developers to write custom filters for Envoy in languages like C++, Rust, Go, or AssemblyScript, compile them to WASM, and dynamically load them into Envoy. This offers several significant advantages:

• Performance: WASM modules execute at near-native speeds.
• Portability: Once compiled, a WASM module can run in any WASM-compatible runtime, including Envoy.
• Isolation and Security: WASM modules run in a sandboxed environment, preventing them from interfering with the proxy's core functionality or other modules.
• Dynamic Loading: WASM filters can be updated and reloaded into Envoy without requiring a full proxy restart, enabling rapid iteration and deployment of new policies.

Combining Envoy's robust proxy capabilities with WASM's flexibility allows you to build an API Gateway that can enforce real-time, adaptive policies. For example, a WASM filter could inspect incoming requests, check IP reputation, device intelligence, or even integrate with a real-time fraud detection service, then decide whether to allow the request, challenge the user with additional verification (like Didit's Passive & Active Liveness), or block it entirely.

Building Adaptive Friction Policies with Envoy and WASM

To implement adaptive friction, your WASM filter would typically:

1. Extract Request Context: Gather information like IP address, user agent, requested endpoint, and authentication status.
2. Integrate with Risk Engines: Call out to an external risk assessment service or an internal policy engine. This is where Didit's robust identity suite can be invaluable. For instance, if the risk engine flags a user, the WASM filter could trigger a step-up verification flow using Didit's ID Verification or 1:1 Face Match.
3. Evaluate Policies: Based on the risk score and predefined rules, determine the appropriate action.
4. Enforce Action:
• Pass-through: Allow the request to proceed.
• Step-up Verification: Redirect the user to a verification flow (e.g., Didit's Age Estimation for age-restricted content or Proof of Address for financial services).
• Block: Deny the request and return an error.
• Rate Limit: Apply more stringent rate limits for suspicious activity.

This dynamic approach allows you to enforce policies like:

• If a user logs in from a new device or unusual location, trigger a liveness check using Didit's Passive & Active Liveness before granting access.
• For high-value transactions, require a full ID Verification using Didit's OCR and MRZ scanning capabilities.
• For users accessing age-restricted content, integrate Didit's privacy-preserving Age Estimation to confirm eligibility.
• Perform real-time AML Screening & Monitoring through Didit for financial transactions flagged as high-risk.

The power of WASM means these policies can be written, tested, and deployed independently of the Envoy binary, offering unprecedented agility in responding to evolving threats and compliance requirements.

How Didit Helps

Didit is the AI-native, developer-first identity platform that perfectly complements an Envoy + WASM API Gateway for adaptive friction. Our modular architecture and clean APIs allow for seamless integration into your custom WASM filters or directly into your application logic. Didit provides the core identity primitives necessary for real-time risk orchestration and automated trust:

• ID Verification (OCR, MRZ, barcodes): Automate document checks for global identity verification.
• Passive & Active Liveness: Combat deepfakes and presentation attacks with advanced biometric liveness detection.
• 1:1 Face Match & Face Search: Securely link users to their verified identities.
• AML Screening & Monitoring: Ensure compliance with global regulations by screening against watchlists.
• Age Estimation: Privacy-preserving age verification for regulated industries like gaming, alcohol, and app stores.
• Proof of Address: Verify residential addresses quickly and efficiently.
• Phone & Email Verification: Enhance account security and prevent fake registrations.

By integrating Didit's comprehensive suite, your Envoy + WASM gateway can make intelligent, real-time decisions about trust and risk. Didit's Free Core KYC offers a powerful starting point, and its pay-per-successful-check model, coupled with no setup fees, makes it an economically viable and highly scalable solution for businesses of all sizes. Our AI-native approach ensures accuracy and efficiency, driving automation over manual review and providing structured identity data for better insights and compliance.

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