MediaWiki:Securepoll-urandom-not-supported/qqq

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As to the meaning of cryptographic random number, see wikipedia:Cryptographically secure pseudorandom number generator for reference.

The /dev/urandom cryptographic random number generation device is not supported on servers running Microsoft Windows. On other platforms the Securepoll-dump-no-urandom message is generated if opening of the /dev/urandom device fails.