Classification

Technology

Advantages

Limits

AAmplify Noise

Analog

Simple structure

High energy consumption

Oscillator

Couple Oscillator

Digital

Easy integration

Vulnerable to frequency attacks

Ring Oscillator

Digital

Good portability

Hermetic

FIRO/GARO

Digital

More sensitive to jitter

Vulnerable to feedback

connections leading

to arbitrary output

Metastability

Digital

Easy integration

Sensitive to physical

phenomena and

vulnerable to symmetry

of metastability

Chaos

Continuous Time

Analog

High rate

High energy consumption

Discret Time

Digital

High rate

Finite computable

precision with a

pseudo-random output