Suppose a given random number generator has poor entropy, and is compressible by any compression algorithm (zlib, bzip2, lzma, etc).

Specifically the issues with this RNG are:

* Bad entropy
* Bad seed size
* Failure to use multiple sources of entropy
* Reseeding only occurs once, at initialization, instead of at an interval. (less important than the issues mentioned above)

I'm asking this question so I can:

* ..estimate the loss of security created by bad entropy
* ..understand what aspects of encryption would be affected, and what wouldn't be affected (hashing, encryption, signatures, etc)