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How to create encrypted 7Z ARC PEA ZIP archives
To password protect files within archives, chose an archive type supporting encryption, as ZIP, 7Z, ARC, and PEA, add files to the archive being created as explained in the FAQ page, then click on the padlock icon to set a password and optionally a keyfile for the archive - the icon is in the status bar in the file/archive browser, and under the output file name in the archive creation interface.
Please note the password will be applied to the objects that will be added to the archive in the current operation - 7Z, ARC, ZIP, and ZIPX archives support file level encryption (supports mutiple encryption passwords), so each file in an archive could have, if desired by the archive creator, a different password - so applying a password to an existing archive will not affect it (will not apply password protection to already archived files). |
PeaZip provides an integrated utility to create random keyfiles and passwords sampling entropy from the system and from user's interaction, Crtl+F9 or main applications' menu Tools > Create random password / keyfile |
The password list file is saved in private user's path, allowing each user to maintain a personal password manager containing different passwords or passphrases not accessible to other standard users of the same system.
Optionally, the user can decide to encrypt the password list with a master password, making the passwor manager private even to administrative accounts of the same machine, being the data file unreadable until the correct password is provided.
Some archive types, like 7Z and ARC, support encrypting files names of items added to the archive: in this case it will not even be possible to see the list of archive's content, file and directory names (in case the very names expose sensitive information), without knowing the password. This option is available in Password dialog - PEA format will always encrypt name of files inside an encrypted 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 file encoded in Base64 (RFC 4648) is prepended to the password used to build the archive, using standard archive format encryption mechanism.
This simple password / keyfile combination scheme allows to retain read compatibility with any other file archiver, even ones not supporting keyfile parsing (or with different two factor authentication implementation), simply passing the Base64-encoded SHA256 hash of the keyfile as the first part of the password.
KNOWN LIMITATION: two factor authentication is not available for self-extracting archives (which can be built with 7Z or ARC compression), because usage of keyfile is not supported by available SFX modules - otherwise resulting executables would be unable to exctract themselves. When a self-extracting archive is created, only the password (if provided) will be used for encrypting it, and only the password will be needed to extract & decrypt it. |
For increased security, PeaZip file manager supports secure file deletion to erase tracks of unwanted data.
This also means it is not possible, by design, to implement a fast password-changing or password-removal 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 / remove 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.