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7-Zip 是一款开源的解压缩软件。主要用在Windows操作系统，Unix-like的操作系统如Linux与FreeBSD下面有7-zip的移植版本p7zip可以使用。它提供命令行接口的程序或图形用户界面的程序，而且可以与资源管理器结合。7-Zip是自由软件，由Igor Pavlov于1999年开始发展，并把主体在GNU LGPL下发布，加密部份使用AES的代码，使用 BSD license发布，解压RAR部分使用RAR特定的许可协议。 7-Zip 主要特征- 使用了 LZMA 与 LZMA2 算法的 7z 格式 拥有极高的压缩比
- 支持格式：压缩 / 解压缩：7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
- 仅解压缩：ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z
对于 ZIP 及 GZIP 格式，7-Zip 能提供比使用 PKZip 及 WinZip 高 2-10% 的压缩比为 7z 与 ZIP 提供更完善的 AES-256 加密算法7z 格式支持创建自释放压缩包Windows 资源管理器集成强大的的文件管理器更给力的命令行版本支持 FAR Manager 插件支持 87 种语言 7-Zip 适用于 Windows 10 / 8 / Win7 / Vista / XP / 2013 / 2008 / 2003 / 2000 / NT。并且有支持 Linux / Unix 平台的命令行移植版本。20.02 alpha 2020-08-08- The default number of LZMA2 chunks per solid block in 7z archive was increased to 64.It allows to increase the compression speed for big 7z archives, if there is a big numberof CPU cores and threads.- The speed of PPMd compressing/decompressing was increased for 7z/ZIP/RAR archives.- The new -ssp switch. If the switch -ssp is specified, 7-Zip doesn't allow the systemto modify "Last Access Time" property of source files for archiving and hashing operations.- Some bugs were fixed.- New localization: Swahili.20.00 alpha 2020-02-06- 7-Zip now supports new optional match finders for LZMA/LZMA2 compression: bt5 and hc5,that can work faster than bt4 and hc4 match finders for the data with big redundancy.- The compression ratio was improved for Fast and Fastest compression levels with thefollowing default settings:- Fastest level (-mx1) : hc5 match finder with 256 KB dictionary.- Fast level (-mx3) : hc5 match finder with 4 MB dictionary.- Minor speed optimizations in multithreaded LZMA/LZMA2 compression for Normal/Maximum/Ultracompression levels.- bzip2 decoding code was updated to support bzip2 archives, created by lbzip2 program.- Some bugs were fixed.- New localization: Turkmen.19.02 alpha 2019-09-05- 7-Zip now can unpack files encoded with Base64 encoding (b64 filename extension).- 7-Zip now can use new x86/x64 hardware instructions for SHA-1 and SHA-256, supportedby AMD Ryzen and latest Intel CPUs: Ice Lake and Goldmont.It increases- the speed of SHA-1/SHA-256 hash value calculation,- the speed of encryption/decryption in zip AES,- the speed of key derivation for encryption/decryption in 7z/zip/rar archives.- The speed of zip AES encryption and 7z/zip/rar AES decryption was increased withthe following improvements:- 7-Zip now can use new x86/x64 VAES (AVX Vector AES) instructions, supported byIntel Ice Lake CPU.- The existing code of x86/x64 AES-NI was improved also.- There is 2% speed optimization in 7-Zip benchmark's decompression.- Some bugs were fixed.19.00 2019-02-21- Encryption strength for 7z archives was increased:the size of random initialization vector was increased from 64-bit to 128-bit,and the pseudo-random number generator was improved.- Some bugs were fixed.18.06 2018-12-30- The speed for LZMA/LZMA2 compressing was increased by 3-10%,and there are minor changes in compression ratio.- Some bugs were fixed.- The bug in 7-Zip 18.02-18.05 was fixed: there was memory leak in xz decoder.- 7-Zip 18.02-18.05 used only one CPU thread for bz2 archive creation.官网地址：https://www.7-zip.org/官网更新记录： https://www.7-zip.org/history.txtDownload 7-Zip 20.01 alpha (2020-08-06) for Windows:x86: https://www.7-zip.org/a/7z2002.exex64: https://www.7-zip.org/a/7z2002-x64.exeDownload 7-Zip 19.02 (2019-9-5) for Windows:x86: https://7-zip.org/a/7z1902.exex64: https://7-zip.org/a/7z1902-x64.exeDownload 7-Zip 19.00 (2019-2-24) for Windows:x86: http://www.7-zip.org/a/7z1900.exex64: http://www.7-zip.org/a/7z1900-x64.exeDownload 7-Zip 18.06 (2018-12-30) for Windows:http://www.7-zip.org/a/7z1806.exehttp://www.7-zip.org/a/7z1806-x64.exeDownload 7-Zip 18.05 (2018-05-01) for Windows:7-Zip for 32-bit Windows:http://7-zip.org/a/7z1805.exehttp://7-zip.org/a/7z1805.msi7-Zip for 64-bit Windows x64:http://7-zip.org/a/7z1805-x64.exehttp://7-zip.org/a/7z1805-x64.msiDownload 7-Zip 16.04 (2016-10-04) for Windows:7-Zip for 32-bit Windows:http://7-zip.org/a/7z1604.exehttp://7-zip.org/a/7z1604.msi7-Zip for 64-bit Windows x64:http://7-zip.org/a/7z1604-x64.exehttp://7-zip.org/a/7z1604-x64.msi
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