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RomuMono

RomuMono is the fastest member of the Romu (Rotate-Multiply) family of pseudo-random number generators. It uses only a single 64-bit state variable with rotation and multiplication operations to achieve extreme speed while maintaining acceptable statistical quality.

Properties

Property	Value
Category	Random Number Generators
Sub-category	Non-Cryptographic PRNG
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	Mark Overton
Year	2020
Origin	🇺🇸 United States
Source	algorithms/random/romumono.js

Parameters

Parameter	Supported values
Seed sizes	8 bytes (64 bits)

Capabilities

Flag	Value
IsDeterministic	Yes
IsCryptographicallySecure	No

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• Original Paper: The Romu Random Number Generators (arXiv:2002.11331)
• Romu Generator Overview
• PractRand Test Results

References

• PCG: Romu - A Good PRNG
• TestU01 Statistical Testing Suite

Test vectors

4 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — Seed x=1: First four 64-bit outputs from RomuMono

Field	Value
seed	0100000000000000
outputSize	32
input	null
expected	0100000000000000f4199c5eba627a02b80421e533ec27d6c21f9f404f373fa4

Vector 2 — Seed x=0: First four 64-bit outputs from RomuMono

Field	Value
seed	0000000000000000
outputSize	32
input	null
expected	0000000000000000000000000000000000000000000000000000000000000000

Vector 3 — Seed x=0x0123456789ABCDEF: First four 64-bit outputs

Field	Value
seed	efcdab8967452301
outputSize	32
input	null
expected	efcdab896745230111c2812d702ce264c14ed2dd0f1d50ea3afeeb5c4c652d2b

Vector 4 — Seed x=0xFFFFFFFFFFFFFFFF: First four 64-bit outputs

Field	Value
seed	ffffffffffffffff
outputSize	32
input	null
expected	ffffffffffffffff0be663a9459d85fd68b456cc11b11dfae0d50bc593b1dc8f

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