When verification becomes a critical dependency, continuity belongs in the security design. Failure policy matters alongside redundancy.
Evaluation approach
Set timeouts, retry limits, capacity and failure responses. A surge of simultaneous retries must not worsen an outage.
Application example
Exercise controlled waiting and safe deferral when verification slows down.
Limits and considerations
Endless retries do not provide reliability. Silently accepting every request hides the security decision.
How dependency failures spread
A slow verification service can stall many mobile operations together. Design timeout, retry and capacity limits; unrestricted retries can overload the failing service.
Different transaction classes may need different responses. State the residual risk explicitly. Outage exercises should verify pending operations and recovery as well as error screens.
Checks and decisions
- Allocate dependency budgets
- Bound retries
- Document outage behavior
Choose availability and security tradeoffs before an incident.
Sources
The primary references above provide the technical basis. Example workflows and evaluation suggestions are this publication’s explanations, not independent test results for a particular product.