1. What a physical entropy generator is
A physical entropy generator does not create randomness with an algorithm alone. It measures unstable real-world phenomena such as radio noise, receiver thermal noise, and tiny SDR hardware fluctuations.
Samples from receivers enter a shared pool, where they are filtered, mixed, and converted into bytes available through public endpoints.
2. SDR noise collection
Software Defined Radio receivers can observe radio spectrum regions and provide input that is not just a programmed sequence. This makes them useful for later conditioning.
3. SHA-512 conditioning
Raw signal may contain bias and local correlations, so the system uses SHA-512 mixing to safely spread physical input material.
View live entropy pool statistics ->4. API access
The resulting stream can be fetched as a file, a `/raw` buffer, or a stream. Critical uses should mix it with the local system CSPRNG.
curl -s "https://entropy.sparksome.pl/raw?bytes=512" --output entropy-seed.bin