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RANLUX24

RANLUX24 is the C++ standard library implementation of Martin Lüscher’s luxury-level random number generator. It uses a 24-bit subtract-with-borrow base engine with a discard block adaptor that discards 200 out of every 223 generated numbers for improved statistical quality.

Properties

Property	Value
Category	Random Number Generators
Sub-category	Pseudo-Random Number Generator
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Martin Lüscher
Year	1994
Origin	🇨🇭 Switzerland
Source	algorithms/random/ranlux24.js

Parameters

Parameter	Supported values
Seed sizes	4 bytes (32 bits)

Capabilities

Flag	Value
IsDeterministic	Yes
IsCryptographicallySecure	No

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• C++ Reference: std::ranlux24
• Original Paper: M. Lüscher (Computer Physics Communications 1994)
• C++ subtract_with_carry_engine Documentation
• Martin Lüscher’s RANLUX Page

References

• C++ Standard Library Random Number Generators
• F. James: RANLUX Implementation (Computer Physics Communications 1994)

Test vectors

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

Vector 1 — C++ std::ranlux24 with seed 1, first 5 outputs

Field	Value
seed	01000000
outputSize	15
input	null
expected	0c5f871f153967fc4f6cb618599fb0

Vector 2 — C++ std::ranlux24 with seed 314159265 (FORTRAN default), first 5 outputs

Field	Value
seed	a1b0b912
outputSize	15
input	null
expected	117f61a40213310c8a02a7552fcfea

Vector 3 — C++ std::ranlux24 with seed 12345, first 5 outputs

Field	Value
seed	39300000
outputSize	15
input	null
expected	6bfbfaa56bafc20b1c49a1b4d08033

Vector 4 — C++ std::ranlux24 with seed 42, first 5 outputs

Field	Value
seed	2a000000
outputSize	15
input	null
expected	9f9b35687a5d41631f63ed0df023fa

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