 |
|
| |
|
|
|
at Global Oneness Community.
Share your dreams and let others help you with the interpretation!
Dream Sharing Forum
|
|
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 |
|
|
|
More material related to 7z can be found here:
|
|
|
« Back
|
Search the Global Oneness web site |
|
|
|
|
|
Sneak-Peek of Global Oneness Community
Hi friend! The Global Oneness Community, the place for information and sharing about Oneness is not really launched yet (you will see there is still some clean up to do) ...but it is now open for a sneak-peek! And if you wish - please register and become one of the very first members to do so! Jonas
Forum Home,
Articles,
Photo Gallery,
Videos,
News,
Sitemap
...and much more!
|
