The amount of raw computing power found in a 25-GPU cluster is more than enough to take a crack at 6.6 quadrillion password combinations. Just in case your mind is boggled by the amount, let's just put it simply. That amount is more than enough to check just about every possible eight-character password, ranging from upper/lower-case letters to digits and symbols in a matter of 5.5 hours. Microsoft's NTLM cryptographic algorithm that has seen action since Windows Server 2003, is relatively weak and particularly insecure in some enterprise settings by today's standards.
Ubergizmo , 25 GPU Cluster Guesses Windows Passwords In Under 6 Hours, 25 GPU Cluster Guesses Windows Passwords In Under 6 Hours
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