Various methods to recover passwords
Instant password recovery
It generally refers to the rapid recovery of password if it is weakly encrypted. An example would be the password for the Access database or older word or excel files.
In some cases there is a possibility to reset the password by replacing or deleting them from the file directly.
It is the most common method of decrypting files. This attack simply tries every combination of characters in a given set to try to recover your password. To recover a password consisting of `a` lowercase letter for example, 26 combinations are needed (from ‘A’ to ‘z’). In the case of two letters we have 26×26 = 676. We are dealing with exponential growth so as automatic password combination is higher so password recovery is more difficult. Certainly the combination can have capital letters, numbers or special characters, in this case a long passwords recovery can be done in days or weeks (depending on length). We use specialized software to distribute the computing power on multiple servers, thus significantly reduces password recovery time.
This method of recovery uses a dictionary. Specialized software tries every word in the dictionary as the password. Besides the common words a good dictionary contains some commonly used combinations in passwords like ‘qwerty’. Dictionary password recovery method is usually much faster than brute-force attack. Of course if the dictionary is large password recovery will be slower, but this method is usually used before a brute-force password recovery. There are different ways of combining the two types of recovery mentioned (hybrid methods).
Variation in password
This recovery method is usually used when the password was probably typed wrong. Usually the user knows the password contained a certain word and maybe some numbers. Or maybe the password was mistyped, or a character was omitted. Usually the number of combinations is low and the password will be quickly recovered.
Plain text password attack
This method is most commonly for zip archives protected by password. Password Recovery is easier when partial of the archive contents is known. For example, we know some of the encrypted files inside the archive. Or perhaps archive contains certain standard DLLs can be found inside the Windows or unencrypted on internet.
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