An underlying assumption of a brute-force attack is that the complete key space was used to generate keys, something that relies on an effective random number generator, and that there are no defects in the algorithm or its implementation. For example, a number of systems that were originally thought to be impossible to crack by brute force have nevertheless been cracked because the key space to search through was found to be much smaller than originally thought, because of a lack of entropy in their pseudorandom number generators. These include Netscape's implementation of SSL (famously cracked by Ian Goldberg and David Wagner in 1995) and a Debian/Ubuntu edition of OpenSSL discovered in 2008 to be flawed.[12][13] A similar lack of implemented entropy led to the breaking of Enigma's code.[14][15]
The advent of GPU computing over the past decade has contributed to huge boosts in offline password cracking. But until now, limitations imposed by computer motherboards, BIOS systems, and ultimately software drivers limited the number of graphics cards running on a single computer to eight. Gosney's breakthrough is the result of using VCL virtualization, which spreads larger numbers of cards onto a cluster of machines while maintaining the ability for them to function as if they're on a single computer.
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