AES is based on a design principle known as a Substitution permutation network. WinRaR uses a very powerful encryption method known as AES. Third-party programs that can only read (unpack) RAR files include: WinZip (Windows), RarZilla (Windows), 7-Zip (multiplatform), IZArc (Windows), PeaZip (Windows, Linux), Zipeg (Windows, Mac OS X), ALZip (Windows) and PowerArchiver (Windows), along with the free version of unrar (which is available for Linux and FreeBSD). RAR for Pocket PC is the only freeware for creating RAR files.

RAR files may be created only with commercial software WinRAR, RAR, and software that has permission from the licensor Alexander Roshal (Eugene's brother). It was developed by a Russian software engineer, Eugene Roshal (the first letter of his surname contributing to the name of the archive format), and is currently licensed by win.rar GmbH It is a proprietary archive file format that supports data compression, error recovery, and file spanning.

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