When one party uses the system to send a message to another party, it should not be possible for the first party to falsely deny having sent the message, falsely deny its contents.
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| namespace | SABSA |
| stereotype | RiskAttribute |
| softMetric | Independent audit and review against Security Architecture Capability Maturity Model with respect to the ability to prevent repudiations that cannot be easily resolved. |
| hardMetric | Reporting of all incidents of unresolved repudiations, including number of incidents per or to period, severity, and type of repudiation. |