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Assess & plan

SP 800-90B Entropy Source Readiness Checker

Identify preparation gaps before a deeper entropy-source assessment — across source characterization, data collection, health testing, conditioning and documentation.

This is not a compliance checker. It produces no certification likelihood, no percentage score, no pass/fail, and no statement that a source is “NIST ready”. It simply organises your answers into areas that look documented and areas worth investigating.

This tool runs entirely in your browser. Nothing you enter is sent to QRNG.io, iQrypto, an AI service or any third party.

Source definition

Is the noise source identified and documented?

Is the point where raw noise data is sampled documented?

Are operating conditions relevant to the source documented?

Is the sample representation/bits per symbol known?

Entropy model and estimate

Is there a documented entropy model or basis for the entropy claim?

Is the claimed min-entropy per sample documented?

Is the relationship between raw and conditioned output documented?

Data availability

Can you collect a large sequential raw-noise dataset?

Can you collect restart data from genuine restarts/reset events?

If a non-vetted conditioning component is used, can its output be collected for the relevant assessment?

Health testing

Are continuous health tests defined?

Is start-up behavior documented?

Is failure handling documented?

Are thresholds/cutoffs justified and controlled?

Conditioning and RBG integration

Is conditioning identified and documented?

Is the entropy accounting before/after conditioning clear?

If a DRBG is used, is the entropy-source-to-DRBG relationship documented?

Download the detailed report

A text report of your three lists and suggested next steps. Generated in your browser — your answers never leave your computer.

Your email and organisation are stored so we can deliver the resource and administer the request. Updates are only sent if you tick the box above — the download works either way. Your tool inputs, answers and entropy data stay on your own computer and are never collected by QRNG.io.

Entropy Source Evaluation Checklist

A printable engineering discussion aid covering source, entropy claim, monitoring, conditioning, data, integration and assurance. Not a certification checklist.

Your email and organisation are stored so we can deliver the resource and administer the request. Updates are only sent if you tick the box above — the download works either way. Your tool inputs, answers and entropy data stay on your own computer and are never collected by QRNG.io.

Primary sources