On Wed, 9 Jan 2002, David Kramer wrote:

> Just to add to to this a little, /dev/random is a queue of numbers that 
> get built up from real-world events, like keystrokes and mouse movements.  
> That's why when generating PGP keys you need to type- otherwise PGP just 
> sucks the queue dry and waits for more,

Reading from /dev/urandom, in contrast, will never block. If the queue 
runs dry, Linux will start to use a cryptographic algorithm to generate 
pseudorandom numbers. 
You can use /dev/urandom if you can live with a lower quality of random 
numbers and if performance is more important.

Werner




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