A place to ask security related questions. All questions are welcome.

Zip Password Recovery Tool (Zip Password Cracker) is an easy to use free software program designed to recover lost or forgotten passwords for encrypted ZIP archives. It supports a number of exclusive attacks to crack zip passwords.

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You can bruteforce using a tool like John-the-ripper or, better yet, hashcat. Practically, not so much. Unless you have a good idea about what the password looks like, the search space is too large, and the 7-zip format too well-encrypted to bruteforce quickly. A high-end password cracking rig can only try about 60k passwords per second against 7-zip, which sounds like a lot, until you realize that there are 56 unique 12-character passwords containing just letters and numbers, and it would take about years to try every single one.

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PeaZip is a free cross-platform file archiver & encryption utility that provides an unified portable GUI for many Open Source technologies like 7-Zip, FreeArc, PAQ, UPX. Free alternative to WinRar, WinZip and similar proprietary software. - Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP files - Open and extract ACE, ARJ, CAB, DMG, ISO, LHA, RAR, UDF, ZIPX files and more, over 180 archive types supported Features of PeaZip includes: encryoted files opener and extractor, batch creation and extraction of multiple archives at once, convert files, create self-extracting archives, split and join files, strong encryption with two factor authentication, encrypted password manager, secure deletion, find duplicate files, calculate hash and checksum, export job definition as script.

To extract a password protected archive open it with PeaZip (double click if it is a supported file extension) to read and navigate / search its content, then use Extract button in application's toolbar. Otherwise, use 'Extract' entries in context menu for direct extraction of the encrypted file without browsing / displaying the content of the encrypted archive. If a password is needed for extraction (or browsing, if ) PeaZip will prompt a form to enter the password or passphrase - and optionally a keyfile, if two factor authentication is in use. Some archive types, like, and, supports encrypting the list of files and folders contained in the archive (option usually identified as ' encrypt file names'), to protect this information from unauthorized users, so the password will be required even for listing / browsing the archive - without providing correct password the archive TOC will not be decrypted and will not be visible, disallowing archive browsing / searching. In other cases, when the TOC of archive is not encrypted, it is possible to browse the password protected archive, but the password will be required to extract the encrypted data; in PeaZip's file / archive browser you can enter the password clicking the proper context menu entry or clicking on the locker icon in the status bar or pressing F9. Current revisions of mainstream archive formats like (7Z, ARC, PEA, RAR, and ZIP/ZIPX) uses strong file encryption, and it is unlikely to be possible to brute-force it with any kind of utility if the password is unknown or was forgotten.

In some cases PeaZip may not able to view and browse archive's content not because it is encoded but because it is corrupted or was created out of standard: in all those cases PeaZip will always display the password dialog, to let the user in control of choosing if entering a password for trying to decrypt the archive, even if the is not usually associated with archives supporting encryption, as file extension can be easily changed. If you got a corrupted archive you will need to re-download it from a trusted source or restore it from a backup copy.

If you have to work on different archives with the same password you will not need to re-enter it since it will be kept until you change it or close PeaZip. If you open different instances of PeaZip each will start with no password and can keep a different password. PeaZip, unlike most other file archivers, supports optional two factor authentication, requiring a password and a keyfile to decrypt an encrypted archive built using that option - simply setting a keyfile in the password dialog when creating the archive. If a keyfile is set for any other format than PEA (which has its own way to use keyfile) the SHA256 hash of the keyfile, encoded in Base64 (RFC 4648), will be prepended to the password: this convention allows to open archives built with two factor authentication with any third parts archiver simply passing the Base64-encoded SHA256 hash of the keyfile as the first part of the password. PeaZip also provides an encrypted password manager in Tools > Password manager from main menu, in this way a master password can be used to encrypt passwords the user desires to keep saved. The password manager file is unique for each user on the system using PeaZip, so multiple users can keep multiple separated password lists.