Design
RNG Architecture Builder
Sketch a conceptual random number generator — from entropy source to application — and see the engineering questions your design choices raise.
This tool runs entirely in your browser. Nothing you enter is sent to QRNG.io, iQrypto, an AI service or any third party.
Choose your building blocks
Why architecture questions come before components
Most real-world RNG failures are integration failures: entropy estimated on the wrong data, health tests applied after conditioning, failure states that keep emitting output, or an entropy claim owned by no single component. Sketching the flow first makes those boundaries visible before any specific part is chosen.
Download the architecture worksheet
A text worksheet with your selections and the engineering question list — generated in your browser, so your design choices never leave your computer.
Primary sources
- NISTFinal2015-06SP 800-90A Rev. 1: Recommendation for Random Number Generation Using Deterministic Random Bit Generators
Current final publication; NIST has pre-draft work toward Rev. 2.
- NISTFinal2018-01SP 800-90B: Recommendation for the Entropy Sources Used for Random Bit Generation
NIST lists identified errata to be corrected in a future update/revision.
- NISTFinal2025-09SP 800-90C: Recommendation for Random Bit Generator (RBG) Constructions
Finalized September 25, 2025.