![]() ![]() ![]() There are many security hurdles to overcome. It’s often possible to send in multiple guesses concurrently, but even so online password attacks are very, very slow, compared to offline attacks, which are only speed-limited by the power of the computer you are using. ![]() If it wasn’t (which will be almost all of the time) then you’ll have to repeat the process, sending in another guess and waiting for the response. This means that every password guess you make has to be sent over the network to the appropriate server (along with a username in most cases.) You then have to wait for a response from the server to see if your guess was successful. By using John the Ripper to systematically try out every password from a word list, and then every possible permutation of letters, numbers and other characters for passwords of increasing length, you are bound to find any passwords which are common English words or which are reasonably short.īut what about a situation where you don’t have access to the file containing hashed passwords? This makes things considerably harder, because instead of having the luxury of taking away the file and subjecting it to password attacks at your leisure, you have to perform an online password attack. In the last article in this series we looked at how easy it is to carry out a brute force attack on a password file containing the hashes of users’ passwords. ![]()
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