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7z |  | 7z: Encyclopedia - 7z |  | In computing, 7z is an archive format which allows data compression using a number of compression algorithms. The format was initially implemented by the 7-Zip archiver but the file format is public and 7-Zip's implementation of it is publicly available under the GNU LGPL licence.
The MIME type of 7z is application/x-7z-compressed.
7z - Features and enhancements.
The main features of the 7z format are:
Open, modular architecture (which allows any compression, conversion, or ...
Including:
|  | | 7z, 7z - Compression methods, 7z - Encryption, 7z - Features and enhancements, 7z - Implementations, List of archive formats |  | |
|  |  | 7z: Encyclopedia - 7z
7z
In computing, 7z is an archive format which allows data compression using a number of compression algorithms. The format was initially implemented by the 7-Zip archiver but the file format is public and 7-Zip's implementation of it is publicly available under the GNU LGPL licence.
The MIME type of 7z is application/x-7z-compressed.
7z - Features and enhancements
The main features of the 7z format are:
- Open, modular architecture (which allows any compression, conversion, or encryption method to be used)
- High compression ratio (depending on which compression method is used)
- Strong AES-256 encryption
- Support for large files (up to approximately 16 exabytes)
- Unicode file names
- Support for solid archives
- Compression of archive headers
7z - Encryption
The 7z format supports encryption with the AES algorithm with a 256-bit key. The key is generated from a user-supplied passphrase using an algorithm based on the SHA-256 hash algorithm (with a large number of iterations, to make a brute-force search for the passphrase more difficult).
List of archive formats
7z - Compression methods
The format's open architecture allows additional compression methods to be added to the standard.
The following methods are defined in the current version:
- LZMA - Improved and optimized version of LZ77 algorithm, using Markov chains/entropy coding and Patricia tries.
- PPMD - Dmitry Shkarin's 2002 PPMdH (PPMII/cPPMII) with small changes: PPMII is an improved version of the 1984 PPM compression algorithm (prediction by partial matching).
- BCJ - Converter for 32-bit x86 executables, see LZMA. Compresses target addresses of near jumps and calls.
- BCJ2 - Converter for 32-bit x86 executables, see LZMA. Jump, call and conditional jump targets addresses are compressed separately.
- Bzip2 - Standard Burrows-Wheeler transform algorithm. Bzip2 uses (faster) Huffman coding, while Bzip is using (stronger) entropy coding.
- DEFLATE - Standard LZ77-based algorithm.
7z - Implementations
The following archiving software currently support 7z archive format:
- 7-Zip and p7zip
- Ark
- EZ 7z
- File Roller
- IZArc
- PowerArchiver
- QuickZip
- Squeez
- TUGZip
- WinRAR
- ZipGenius
See also
Other related archives7-Zip, AES, Ark, Burrows-Wheeler transform, Bzip2, DEFLATE, EZ 7z, File Roller, GNU LGPL, Huffman coding, IZArc, LZ77, LZMA, List of archive formats, MIME, Markov chains, PPM compression algorithm, PPMD, Patricia tries, PowerArchiver, SHA-256, Squeez, TUGZip, Unicode, WinRAR, ZipGenius, algorithms, archiving software, brute-force search, computing, data compression, encryption, entropy coding, exabytes, hash algorithm, p7zip, passphrase, solid
 Adapted from the Wikipedia article "7z", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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