7-Zip (64-bit) 9.22 beta

7-Zip has a high compression ratio in new 7z format with LZMA compression. supported formats Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR;

Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM, MSI, WIM, Z, CPIO, RPM, DEB and NSIS.

For ZIP and GZIP formats 7-Zip provides compression ratio that is 2-10 better than ratio provided by PKZip and WinZip. Self-extracting capability for 7z format. Integration with Windows Shell. File Manager, and command line version.

Key Features:

- Strong AES-256 encryption in 7z and ZIP formats

- Self-extracting capability for 7z format

- Integration with Windows Shell

- Powerful File Manager

- Powerful command line version

- Plugin for FAR Manager

- Localizations for 79 languages

7z is the new archive format, providing high compression ratio.

Key features of 7z format:

- Open architecture

- High compression ratio

- Strong AES-256 encryption

- Ability of using any compression, conversion or encryption method

- Supporting files with sizes up to 16000000000 GB

- Unicode file names

- Solid compressing

- Archive headers compressing

LZMA is default and general compression method of 7z format. The main features of LZMA method:

- High compression ratio

- Variable dictionary size (up to 4 GB)

- Compressing speed: about 1 MB/s on 2 GHz CPU

- Decompressing speed: about 10-20 MB/s on 2 GHz CPU

- Small memory requirements for decompressing (depend from dictionary size)

- Small code size for decompressing: about 5 KB

- Supporting multi-threading and P4's hyper-threading

LZMA compression algorithm is very suitable for embedded applications. LZMA is released under the terms of the GNU LGPL. LZMA is also available under a proprietary license for those who can not use the GNU LGPL in their code.

7-Zip also supports encryption with AES-256 algorithm. This algorithm uses cipher key with length of 256 bits. To create that key 7-Zip uses derivation function based on SHA-256 hash algorithm. A key derivation function produces a derived key from text password defined by user. For increasing the cost of exhaustive search for passwords 7-Zip uses big number of iterations to produce cipher key from text password.

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