7z also supports filters that improve compression ratio of main compression method.Now the following filters are integrated to 7z:
BCJ
Converter for x86 executables
BCJ2
Converter for x86 executables
ARM64
Converter for ARM64 executables
ARMT
Converter for 32-bit ARM-Thumb executables
ARM
Converter for 32-bit ARM32 executables
PPC
Converter for PowerPC executables
SPARC
Converter for SPARC executables
IA64
Converter for IA-64 (Itanium) executables
Delta
Converter for WAV files
Swap2/Swap4
Converters for changing the order of bytes
LZMA is default and general compression method of 7z format. The main features of LZMA method:
High compression ratio
Variable dictionary size (up to 4 GB)
Compressing speed: about 2-8 MB/s on 4 GHz CPU (2 cpu threads version).
Decompressing speed: about 30-100 MB/s on 4 GHz CPU (1 cpu thread).
Small memory requirements for decompressing (depend from dictionary size)
Small code size for decompressing: about 5 KB
7-Zip also supports encryption with AES-256 algorithm. This algorithm uses cipher key with length of 256 bits. To create that key 7-Zip uses derivation function based on SHA-256 hash algorithm.A key derivation function produces a derived key from text password defined by user.For increasing the cost of exhaustive search for passwords 7-Zip uses big number of iterations to produce cipher key from text password.
The 7z file extension is a compressed archive format created with 7-zip open-source software. It's similar to a ZIP file but uses a different lossless compression method called LZMA to reduce file size while preserving quality.
What is a 7z file? Similar to a Zip file, 7z files are simply compressed archive files. However, the 7z extension is created by numerous compression utilities — the most notable being the Open Source 7-Zip archiver by Igor Pavlov.
These files, known as “7z” or “7-Zip” files, are archives of one or more files in one compressed package. On Windows, you'll need to install an app that can extract 7z files—a free option is 7-Zip, but you can also use WinZip.
Click on the file or folder you want to compress then click Add.
The Add to Archive window will pop up, make sure the Archive format is set to zip, and click OK to proceed. The file will be compressed into a zip file located in the same place as the original file.
7-zip is generally considered safe to use. It has been widely used for many years, and its source code has been reviewed by security experts due to its open-source nature. However, like any software, it's important to download it from trusted sources and keep it up to date to minimize any potential security risks.
LZMA is default and general compression method of 7z format. The main features of LZMA method: High compression ratio. Variable dictionary size (up to 4 GB)
Archive format = 7z (Do not choose ZIP, this uses a much less secure encryption method) Enter a strong password that meets CU requirements (please do not use “concord” or “12345” or other weak password) Encryption method = AES-256 (the strongest and most secure encryption method)
How do I install 7-zip? To install 7-zip on your computer, you can visit the 7-zip website and download the installer for your operating system. Once downloaded, run the installer and follow the on-screen instructions to complete the installation.
Introduction: My name is Van Hayes, I am a thankful, friendly, smiling, calm, powerful, fine, enthusiastic person who loves writing and wants to share my knowledge and understanding with you.
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