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

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FAQ / DATA SECURITY > CHANGE PASSWORD OF ARCHIVE
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Change password of existing archives



HOW TO CHANGE ENCRYPTION PASSWORD OF ARCHIVES

change rar zip encryption password



Mainstream archive formats (including 7Z, RAR, and ZIP/ZIPX) supports file level encryption, which means a single archive can (potentially) contain files encrypted with different passwords, and even mix encrypted and non encrypted files - updating existing archives let user provide an arbitrary password at each instance.

Extraction of data from encrypted archives requires the appropriate password being provided to the decryption procedure, consequently working with an archive protected by different passwords for different group of files it needs to separately, selectively, extract each group of file with the right password.

This also means it is not possible, by design, to implement a fast password-changing mechanism in archive formats supporting this feature.

Fast password modification mechanisms usually rely on encrypting data with a random system-generated password, which is then encrypted with actual user-provided password, and finally added to the header of the file. Changing the user-provided password would then be possible simply decrypting and re-encrypting the header area containing the random system-generated password (used to encrypt the actual data).

A similar mechanism to replace password in header would not support encrypting single files with different passwords (or let them unencrypted) as required by 7z, rar, and zip standards, which results in fast password modification mechanisms being ruled out by design.


Consequently, the only standard way to change password to existing archive is to:

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extract the old archive, providing the needed current (old) password(s) - the password that will be replaced

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re-create the new archive, providing the new password


Both steps can be time-consuming if large archives are involved - as, basically, to modify password the existing archive needs to be extracted with the old password and re-created with the new password.

PeaZip can help in each step of password change process, allowing to extract multiple files at once (even mixed types), and to create multiple separated archives at once, flagging "Add each object to a separate archive" option. This allows to work on batches of files at once.

Adding a password to unencrypted archive(s) is inherently simpler - as the program does need to know old password(s) - and can be automated using archive conversion procedure. In this case it is sufficient to add archives(s) to conversion procedure, and set a password, to have archive(s) extracted and the re-created with encryption.

PeaZip can save current task as batch script, in order to help automating recurring works, please note passwords will be saved - in order to have batch password-change process run unattended, without asking for user interaction, namely typing the password - so batch scripts containing saved passwords must be securely managed.

PeaZip supports creating encrypted files under following standards - which can be set as destination formats when changing archive password:
  • 7Z with 7-Zip / p7zip AES256-based encryption
  • ZIP with WinZip AE (Advanced Encryption), AES256-based, or ZipCrypto (for legacy support only)
  • ARC with FreeArc AES256, Twofish256, Serpent256, and Blowfish algorithm
  • PEA with PeaZip AES, Serpent and Twofish (128/256 bit) EAX-mode authenticated encryption
This utility also supports, only for extraction, decrypting password-protected ACE, RAR, and ZIPX archives.
Those formats can only be used as sources, not destinations, when replacing password - as the destination of password change needs to be a format supported for writing - so in this case archive type conversion to a fully supported format is required to modify the password protecting the data.


RELATED & SIMILAR PAGES
APPLY ENCRYPTION PASSWORD

ENCRYPT WITH MULTIPLE PASSWORDS
 
OPEN ENCRYPTED ARCHIVES

PASSWORD REQUEST

PROTECT FILES FROM UNAUTHORIZED USERS
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