Generating Unique Keys

[Paul Rubin]

Mongryong <Mongryong at sympatico.ca> writes:
> Right now, I mainly need a way to generate unique (web) session keys. 
> However, it would be nice to have a general purpose function for
> generating unique keys.

On Linux, the simplest way is to just read some random bytes from
/dev/urandom and convert them to hex.  If you read 16 bytes you
get 32 hex digits and almost no chance of collision.