
ILT-U-3933
Entropy Source Assessment PT Scheme (ESAS). Entropy Health Test Failure Analysis (NIST SP 800-90B / NIST SP 800-22)
DETERMINATION / MEASURED PARAMETER | METHOD / STANDARD REFERENCE |
| Entropy-source operational behavior assessment | NIST SP 800-90B, Section 4 — Health Testing |
| Detection of repetitive output anomalies | NIST SP 800-90B, Section 4.4.1 — Repetition Count Test (RCT) |
| Detection of abnormal symbol concentration | NIST SP 800-90B, Section 4.4.2 — Adaptive Proportion Test (APT) |
| Detection of localized entropy collapse regions | NIST SP 800-90B, Section 4 — Health Testing |
| Detection of intermittent entropy failures | NIST SP 800-90B, Section 4 |
| Detection of persistent entropy degradation | NIST SP 800-90B, Section 4 |
| Runtime entropy stability assessment | NIST SP 800-90B, Sections 3 and 4 |
| Operational anomaly characterization | NIST SP 800-90B, Section 4 |
| Statistical characterization of operational failures | NIST SP 800-22 statistical tests (supporting analysis) |
| Frequency anomaly analysis | NIST SP 800-22 — Frequency (Monobit) Test |
| Runs behavior anomaly analysis | NIST SP 800-22 — Runs Test |
| Detection of abnormal repetitive patterns | NIST SP 800-22 — Serial Test |
| Detection of localized statistical degradation | NIST SP 800-22 — Approximate Entropy Test |
| Operational severity assessment | NIST SP 800-90B — Health-test interpretation principles |
| Technical interpretation of runtime entropy behavior | NIST SP 800-90B, Sections 3 and 4 |
| Final operational suitability assessment | NIST SP 800-90B — General entropy-source validation principles |

