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7z is a compressed archive file format that supports several different data compression, encryption and pre-processing algorithms. The 7z format initially appeared as implemented by the 7-Zip archiver. The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License.
7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. [2] 7-Zip has its own archive format called 7z, but can read and write several others.
PeaZip supports encryption [21] with AES 256-bit cipher in 7z and ZIP archive formats. In PeaZip's native PEA format, and in FreeArc 's ARC format, supported ciphers are AES 256-bit, Blowfish , [ 22 ] Twofish [ 23 ] 256 and Serpent 256 (in PEA format, all ciphers are used in EAX authenticated encryption mode ).
A self-extracting archive created using 7-Zip. A self-extracting archive (SFX or SEA) is a computer executable program which combines compressed data in an archive file with machine-executable code to extract the information. Running on a compatible operating system, it does not need a suitable extractor in the target computer to extract the data.
The Free Software project 7-Zip also supports AES, but not SES in ZIP files (as does its POSIX port p7zip). When using AES encryption under WinZip, the compression method is always set to 99, with the actual compression method stored in an AES extra data field. [54]
The 7-Zip implementation uses several variants of hash chains, binary trees and Patricia trees as the basis for its dictionary search algorithm. In addition to LZMA, the SDK and 7-Zip also implements multiple preprocessing filters intended to improve compression, ranging from simple delta encoding (for images) and BCJ for executable code.
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Open sourced archiver with compression using the PAQ family of algorithms and optional encryption. .lzh, .lha application/x-lzh LHA: Originally DOS, now multiple Multiple Yes The standard format on Amiga. .lzx application/x-lzx LZX: Amiga: Archiver originally used on The Amiga. Now copied by Microsoft to use in their .cab and .chm files. .pak ...