Speed and security of /dev/urandom

[Benjamin Kaduk]

On Sat, 19 Jul 2014, Steven Chamberlain wrote:

> Or if we're worried about draining entropy too quickly from the CSPRNG,
> a non-privileged user could do that anyway from /dev/urandom, or it may
> happen when a server doing crypto work is under stress?

Can we please disabuse ourselves of the notion that entropy can be 
"drained too quickly" (or even drained at all) from the CSPRNG?  Once 
properly seeded, it produces unpredictable bits.  Period.  It does not 
matter how many bits are output (well, for achievable quantities of 
output); the bits are still unpredictable.

-Ben