Slashdot Mirror

← Back to Stories (view on slashdot.org)

Cracking Passwords With Amazon EC2 GPU Instances

Posted by CmdrTaco on from the sekrit-p4ssw0rd dept.

suraj.sun writes "As of Nov. 15, 2010, Amazon EC2 is providing what they call 'Cluster GPU Instances': An instance in the Amazon cloud that provides you with the power of two NVIDIA Tesla 'Fermi' M2050 GPUs... Using the CUDA-Multiforce, I was able to crack all hashes from this file with a password length from 1-6 in only 49 Minutes (1 hour costs $2.10 by the way.). This is just another demonstration of the weakness of SHA1 — you really don't want to use it anymore."

1 of 217 comments (clear)

  1. No, it shows that WEAK PASSWORDS are bad by sootman · · Score: 4, Interesting

    "Using the CUDA-Multiforce, I was able to crack all hashes from this file with a password length from 1-6 in only 49 Minutes..." [emphasis mine]

    Sounds like someone missed the day they taught exponents in school.

    Pretend he only tested 72 characters: a-z, A-Z, 0-9. Going from 6 to 8 characters would make this take 5,184x longer. (72x72). 49 minutes x 5184 = about SIX MONTHS.

    --
    Dear Slashdot: next time you want to mess with the site, add a rich-text editor for comments.