!!! Hybrids 

  

 In [Unix] systems, there's commonly a __/dev/random__ device to access a pseudorandom number generator. This generator, however, includes a twist that lets it generate higher quality random numbers than otherwise expected: its seed is periodically perturbed using using low-level timing information from the network, mouse, keyboard, and possibly other entropy sources, which only the [Kernel] has proper access to. This generator is also a FiniteStateMachine but it has access to unique inputs which are hard to predict and very hard to spy on. The weakness of this approach can be seen by imagining the [Kernel] running as UserModeLinux and the underlying kernel manipulating the value of the ''hardware'' clock---in such a situation it would be possible to force /dev/random to produce the same results repeatedly. It is generally considered a sufficiently good generator for everything except the random numbers to be used in cryptographic suituations PublicKey generation.