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Adobe Acrobat 9 Pro "User Password" encryption principle analysis Tian Yi love 2010-11-23 There are very few articles on pdf file encryption principles that can be found on the Internet. Even if there is only an analysis of encryption in versions earlier than 9.0, most pdf password cracking tools are helpless to files encrypted in Versions later than 9.0, this time, we will only briefly describe the princip

(reproduced, window8.1/64bit System Pro-Test available) 1. Delete C:\Program Files\Common Files\adobe\adobe pcd\cache\cache.db and C:\Documents and Settings\All Users\Application Data\flexnet\adobe_00080000_tsf.data (C:\ProgramData\FLEXnet\adobe_00080000_tsf.data under Windows 8/windows 7/vista System) ) Two record files. It is important to note that the second file is a hidden file, so set the show hidden file first. 2. Then change the Hosts file. Join in C:\windows\system32\drivers\etc\hosts

(log10n), and the time complexity of x in all the numbers is O (nlog10n).The optimal thinking of the algorithm is as follows:Using the mathematical formula to calculate the final result directly, one time to find out the number of x in a nobody, as the occurrence of Budweiser is the number of times, in addition to get the final result. The range of x here is 1-9, because =0 does not conform to the following rules and requires a separate calculation.T

random number of the header file In addition, the program only uses random numbers to generate CAPTCHA characters, and then we need to receive input from the user and compare it with the current verification code to determine if the user input is correct. This work is left to everyone after learning the content behind (various control structures, string processing, etc.), to do it yourself. I believe you will soon be able to do this.------->Please look forward to the following episode: does he

(Rnd_device ());//Verification code altogether 4 bitConstint n =4;Char Code[n];//A character array that holds the verification code//Prompt to enter the verification code cout"Please enter the following verification code:"Endl//Generates 4 Captcha alphabetic characters with A for loopfor (int i = 0; i i) { Span style= "color: #008000;" >// Uni_dist (Reng) for Reng engine uni_dist a random number that produces an average distribution of values between 0 and 25 // and then in ' A ' on the basis