Of the use of unpredictableSeed

[cym13 via Digitalmars-d]

Hi,

I found many times that people use unpredictableSeed in 
combination with normal PRNG for cryptographic purpose. Some even 
go as far as reseeding at each call to try making it more secure.

It is a dangerous practice, most PRNG are not designed with 
security (and unpredictability) in mind, and unpredictableSeed 
was definitely not designed with security in mind (or it failed 
heavily at it). It's a good tool when one needs randomness, not 
security.

I wrote a blog post to present exactly why this is a bad idea and 
how it could be exploited [1].

The best would be to add a standard CSPRNG interface to Phobos 
but we aren't there yet.

[1]: https://cym13.github.io/article/unpredictableSeed.html