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Lessons learned from cracking 4,000 Ashley Madison passwords

by The Gurus
August 27, 2015
in Top 10 Stories
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When hackers released password data for more than 36 million Ashley Madison accounts last week, big-league cracking expert Jeremi Gosney didn’t bother running them through one of his massive computer clusters built for the sole purpose of password cracking. The reason: the passwords were protected by bcrypt, a cryptographic hashing algorithm so strong Gosney estimated it would take years using a highly specialized computer cluster just to check the dump for the top 10,000 most commonly used passwords.
So fellow security expert Dean Pierce stepped in to fill the vacuum, and his experience confirms Gosney’s assessment. The long-and-short of his project is that after five days of nonstop automated guessing using a moderately fast server specifically designed to carry out compute-intensive cryptographic operations, he deciphered just 4,000 of the underlying plaintext passwords. Not surprisingly, the passwords Pierce extracted from just the first 6 million entries in the Ashley Madison table look as weak as those from just about any data breach.
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