Given the number of open-source tools that support password-protected RAR files (e.g. It should be noted, however, that this requires extensive knowledge of the file format itself. This indicates that, given enough knowledge of the RAR file format itself, one could create a tool to AES-decrypt the datastream of the compressed files, and then save it into a new RAR archive. Technically, the data is compressed before being encrypted. You could make a quick batchfile implementing a "remove password" feature, which could simply unrar the archive, and then re-compress the files without a password. With just WinRAR, it is impossible to simply "remove" the password from an archive, since the data itself is encrypted with the password. Version 3 of the RAR file format (implemented first in WinRAR 2.9) encrypts the actual data itself, as well as the file headers (if requested) using AES-128 encryption.
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