High Quality Content by WIKIPEDIA articles! CryptGenRandom is a cryptographically secure pseudorandom number generator function that is included in Microsoft`s Cryptographic Application Programming Interface. In Win32 programs, Microsoft recommends its use anywhere random number generation is needed. A 2007 paper from Hebrew University suggested security problems in the Windows 2000 implementation of CryptGenRandom (assuming the attacker has control of the machine). Microsoft later acknowledged that the same problems exist in Windows XP, but not in Vista. Microsoft released a fix for the bug with Windows XP Service Pack 3 in mid-2008.