Recovering passwords.
Hacking passwords of other people - it is bad!
Recovery of passwords by their hashes MD5, Mysql, Sha-1, Mysql5 is not in fact burglary or hashing algorithms or so-called password-breaking.
To decrypt password by hаsh is not possible because of the irreversibility of hashing algorithm.
The problem of password recovery is limited to a serial search of passwords and may take a very long time on modern computers. If hashes match in the normal case, we can not assert that we've found the original password, in general, this situation is called a collision, and password recovery does not necessarily coincide with the claimed one. When the recovery of input passwords ranged from 1 to 12 characters with the help of serial search is implemented, usually the result happens to be the desired one. If the recovered password does not match the required password, and hashes are identical, then this is the case of collision. The longer hash of password is, the less are chances of collisions to appear.
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