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Libmcrypt, Mcrypt's companion, is a library of code that contains the actual encryption functions and provides an easy method for use. The last update to libmcrypt was in 2007, [1] despite years of unmerged patches. [2] Maintained alternatives include ccrypt, libressl, and others. [3] Examples of mcrypt usage in a Linux command-line environment:
ZipGenius 6 is capable of opening a variety of formats commonly used with Linux, such as RPM, TAR, TAR.GZ, TGZ, GZ and 7Z. As regards data security, the archive history file is encrypted, the most recently used files list can be enabled (always or per-session) or disabled, and CryptoZip 2.1 gives encryption algorithms to lock user archives.
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.
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 introduced in 2001, [12] but can read and write several others.
zpaq add directory/archive.zpaq directory/source_directory -mX -key password. The options -mX (with X being the compression level from 0 to 5) and -key (which performs AES-256 encryption) can be omitted. The 0 compression level does not compress data, but still carries out data deduplication.
The 7-Zip program is publicly available under the terms of the GNU Lesser General Public License. The LZMA SDK 4.62 was placed in the public domain in December 2008. The latest stable version of 7-Zip and LZMA SDK is version 24.09. [2] The 7z file format specification is distributed with 7-Zip's source code since 2015.
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.
The operating systems the archivers can run on without emulation or compatibility layer. Ubuntu's own GUI Archive manager, for example, can open and create many archive formats (including Rar archives) even to the extent of splitting into parts and encryption and ability to be read by the native program.