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In page PHP:
"There are two attacks that can be performed over PHP entropy sources: "seed attack" and "state recovery attack".[citation needed] As of 2012, a $250 GPU can perform up to 230 MD5 calculations per second, while a $750 GPU can perform four times as many calculations at the same time.[4] In combination with a "birthday attack" this can lead to serious security vulnerabilities.[citation needed]
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