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Introduction

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Advanced ZIP Password Recovery (or AZPR) is a program to recover lost or forgotten passwords to ZIP archives (compressed files) created in programs like WinZip, PKZip etc. The key features of AZPR are:

·The program has a convenient user interface  
·The program is very fast: for ZIP, brute-force attack speed is up to fifteen million passwords per second on modern CPUs like Pentium 4 (Prescott)  
·The program can work with archives containing only one encrypted file  
·Archives created by various software packages are supported  
·Self-extracting archives are supported  
·The program is customizable: you can set the password length (or length range), the character set to be used to generate the passwords, and a couple of other options  
·You can select the custom character set for brute-force attack (non-English characters are supported)  
·Dictionary-based attack (with word mutations) is available  
·The "brute-force with mask" attack is available  
·Very fast known-plaintext attack is available  
·You can interrupt the program at any time, and resume from the same point later  
·The program can work in the background, using the CPU only when it is in idle state  

Please note, however, that for the password is not stored anywhere in the archive (ZIP file), and so it cannot be just extracted or decrypted. Instead, AZPR can recover it by trying different passwords: all possible combinations in a given range, or from a wordlist, etc. AZPR can test as many as fifteen million passwords per second, and so the likelihood of finding a valid one is very high. There is still no guarantee that the password will be recovered, but here the human factor plays its role: most people use short and/or easy to remember passwords. We estimate the success rate as 90-95%. See Passwords and encryption and Known bugs and liminations for more information.

The program that is licensed to you is absolutely legal and you can use it provided that you are the legal owner of all files or data you are going to recover through the use of our software or have permission from the legitimate owner to perform these acts. Any illegal use of our software will be solely your responsibility. Accordingly, you affirm that you have the legal right to access all data, information and files that have been hidden.

You further attest that the recovered data, passwords and/or files will not be used for any illegal purpose. Be aware password recovery and the subsequencial data decryption of unauthorized or otherwise illegally obtained files may constitute theft or another wrongful action and may result in your civil and (or) criminal prosecution.

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