True random number generator
A true random number generator produces unpredictable values by sampling nondeterministic physical phenomena rather than relying solely on deterministic algorithms.
Hacking Cryptography
A hardware random number generator, or true random number generator, samples nondeterministic physical phenomena to produce unpredictable random values.
- How it is used
- Seeds CSPRNGs with physically sourced entropy for cryptographic random-byte generation.
- How deep it goes
- Explains physical sources, rate and entropy models, tamper resistance, health tests, and reseeding; defers detailed construction mechanics.
- Examples
- Uses rain, radioactive decay, electrical noise, diode designs, HSMs, and Linux entropy devices as concrete examples.
- What you can do after
- Evaluate/understand it by distinguishing a modeled, health-tested entropy source from an untested or deterministic random generator.
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Real-World Cryptography
A true random number generator is a device or system that derives random values from physical nondeterministic phenomena.
- How it is used
- Explains how physical entropy sources support cryptographic randomness when ordinary software events are predictable.
- How deep it goes
- Explains entropy sources, bias, extraction, performance, and contributory mixing, but stops short of implementation details.
- Examples
- Uses thermal noise, Intel RDRAND, boot-time entropy failures, and smart-card hardware as concrete examples.
- What you can do after
- Evaluate physical randomness sources, extraction needs, bottlenecks, and risks from relying on a single source.
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Related concepts
- pseudo-random number generatorkind of · A pseudorandom number generator is a deterministic computational process that uses an initial seed or internal state to produce a sequence with random-like statistical properties.
- cryptographically secure random number generatorused by · A cryptographically secure random number generator produces computationally unpredictable values while resisting prediction and recovery of its internal state by feasible adversaries.
- thermal noiseuses · Thermal noise is random electrical fluctuation caused by the thermally driven motion of charge carriers in a physical system.
- ring oscillatorused by · An electronic oscillator formed by connecting an odd number of inverting logic gates in a ring.
- entropy sourceuses · An entropy source is a physical, computational, or operating-system process that supplies unpredictable or uncertain input for generating random data.
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