![]() ![]() That's about the number of hashes performed every 5 second for the purpose of bitcoin mining by mid 2014 according to that source, or what could be done by a 2000-core general purpose computer in a year of operation. A random 9 character lowercase password needs $26^9 \approx 2.7\cdot 10^$ evaluations of the round function of SHA-1. Using the original default of 1000 iterations, a typical PC can try at least a few thousand passwords a second. time to brute force = number of passwords to try * time to try one.There is no generic answer except the formula: The time it takes depends on how the password is chosen, what iteration count is used with PBKDF2, and what computer(s) used. Unless the underlying PRF is broken, brute force and dictionary attacks are the only way to find the password. If a brute force attack is made using the best ever super computer around how much time will it take to crack it? Firstly, How much time will it take to crack PBKDF2 while using a 9 character password? and how do I calculate the cost? I'm not specifying any specific system or platform.
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