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ISC2 Systems Security Certified Practitioner (SSCP) Practice Question

A financial company exposes an internal payments microservice to a partner bank through an API-management middleware hosted in its DMZ. The partner must act on behalf of individual end users while the payments service should never accept broad partner credentials. Which design best enforces least privilege and provides a verifiable trust path across this third-party connection?

  • The partner places a base64-encoded user ID in a custom HTTP header, which the microservice accepts if the request originates from the middleware's IP address.

  • The partner authenticates once daily with a long-lived mutual-TLS session, and the middleware forwards all subsequent requests under that session.

  • The middleware uses a stored shared database account with full DML rights that the partner invokes through predefined procedures.

  • The middleware exchanges the partner's JWT for a short-lived, scope-limited OAuth2 access token issued per user request before forwarding it to the microservice.

ISC2 Systems Security Certified Practitioner (SSCP)
Access Controls
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