Since the password is nine characters long you will be able to come up with 62^9 possible ways to arrange 26 upper case letters, 26 lower case letters and 10 numerals (1 to 9 and 0) in about 10 years! In case you are interested, it is possible to come up with 472,161,363,286,557,000 possible password combinations, using just your 5 digit first name and the year of birth.Ĭalculation: 2 x 26 lower and upper case letters plus 10 numerals=62. A simple nine digit password (johny1988) using a name and date of birth combination may end up using billions of trial and errors before it is cracked. This dictionary is constantly updated and contains all the previously searched words, phrases and characters used in passwords.īrute-Force Attack – In case the Dictionary method fails, the Brute Force method tries out all possible word and character combinations by using the Brute Force method until it finds the right password.Īlthough it sounds cool, Brute Force is the most inefficient and dumb way to recover passwords.
Hence, this method is based on trying out different combinations of words, phrases and characters available in a specially maintained dictionary.
#Pdf recover pdf
Most password recovery programs use Brute-Force Attack, Dictionary Attack and Mask Attack methods to recover lost PDF file passwords.ĭictionary Attack – Mostly passwords are based on words and phrases.
Owner Password – Used to prevent people from printing, copying, editing, adding or deleting pages from a PDF file.User Password – Used to prevent people from opening or viewing a PDF file.
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