QRNG, explained simply.
Learn how quantum random number generators work, why high-quality entropy matters for cybersecurity, and how CMOS-native QRNG technology can make quantum entropy easier to evaluate and integrate.
An educational QRNG resource by iQrypto, a European quantum security hardware company.
22 in-depth articles · Glossary · Diagrams
What is QRNG.io?
QRNG.io is an educational hub created by iQrypto to explain quantum random number generation, entropy, and QRNG applications in cybersecurity.
Why randomness matters for security
Encryption keys, session tokens, authentication challenges, and post-quantum cryptography all depend on unpredictable random numbers. If the entropy source is weak, the security system can fail even when the cryptographic algorithm is strong.
Keys & tokens
Cryptographic keys, nonces, and session tokens are only as strong as the randomness used to create them.
Secure communications
Protocols that establish confidentiality and authenticity depend on unpredictable values at every handshake.
Post-quantum readiness
Modern and post-quantum schemes still rely on high-quality entropy to seed key generation.
Guess the next number
Two machines hand out numbers, one at a time. One follows a recipe. The other flips a quantum coin. Watch which one you could guess ahead of time.
Machine A — follows a recipe
After a few numbers you can see the loop. Once you know the recipe, you know every number it will ever give — including the ones it has not given yet.
Machine B — flips a quantum coin
There is no recipe to learn. Each number comes from a physical event that has no answer until it happens, so the best anyone can do is a coin-flip guess.
Why this matters
A secret key is just a long string of these numbers. If the numbers came from Machine A, anyone who works out the recipe can rebuild the key. If they came from Machine B, there is no recipe to work out. That is the whole point of a quantum random number generator.
Machine B in this demo uses your browser's secure random numbers. A real QRNG replaces that with a measured physical quantum process.
Start reading
22 articles covering the fundamentals of quantum randomness, how entropy is judged, and where QRNG technology is actually used.
Where would you like to start?
QRNG in plain language
Start from zero: what randomness means in security, why computers struggle with it, and what a QRNG actually does.
Read the guideWhy it matters now
Documented cases where weak random number generation broke real systems, plus the current post-quantum mandates.
See the evidenceExplore CMOS-native QRNG
Understand how silicon-based QRNG technology can support compact, electronics-native integration.
Explore the technologyLook up a term
Entropy, min-entropy, conditioning, health tests — every term used on this site, defined in plain language.
Open the glossaryA European deep-tech hardware company
QRNG.io is powered by iQrypto, a European quantum security hardware company developing practical QRNG technology for evaluation, integration, and deployment.