php - Crack Own Password Database Feasibility -

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with plethora of vbulletin hacks going on lately, have modified 3.8.x software line use password_hash() function in php more security. have designed code converts password when user logs in (forced log in on next visit). problem is, have many users don't log in long time , want protect them too. kicking around idea of purchasing/leasing large gpu power , using hashcat crack , convert passwords have.

from initial testing, works rather until 7-8 character passwords (using ?a charset in hashcat). after that, process slows down crawl. there real hope in doing success, large length passwords? if so, kind of power should get? together, have close million different salted accounts.

is idea feasible?


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