Secure random bytes
live from this server · refreshing
…
$ cat /dev/urandom▍
urandom.ai
Trustworthy randomness for the post-quantum era — real entropy, health-tested, delivered with quantum-resistant, crypto-agile keys. As a Rust library, an HTTP API, and an MCP service for AI agents.
Is anybody using this key? → Open the console Live entropy Docs GoalsSee it live
Is anybody using this key?
verifiable OPRF · your key never leaves this page
Four surfaces
Core
urandom.ai
Secure random bytes & keys over an HTTP API and an MCP endpoint for agents.
Check
check.urandom.ai
Is anybody using this private key? Find out without ever revealing the key.
PQC
pqc.urandom.ai
Crypto-agile ML-KEM-768 & ML-DSA-65, with hybrid X25519MLKEM768 by default.
Lab
lab.urandom.ai
Statistical test batteries and the “aperiodic ≠ random” demonstration.
Why urandom
- Real entropy. OS source → SP 800-90B health tests → SP 800-90A DRBG. Never raw, never faked.
- Post-quantum. NIST FIPS 203 / 204 with hybrid key exchange — secure if either half holds.
- Crypto-agile. Every key is tagged with its algorithm; retire a broken one without a code change.
- Agent-native. A first-class MCP server, so AI agents get keys and randomness the safe way.
- Reveal nothing. Check a key against the seen-key registry with a verifiable OPRF — the server learns nothing, not even a hash prefix.