LZMA2 (optimal for multi-core processors) or LZMA.
Check "Encrypt file names" (crucial). This prevents unauthorized users from even seeing what files are inside the archive without the password. 3. Creating Complex Archives (Command Line) BTB.7z
Extracting compressed .zip or .7z archives with 7-Zip LZMA2 (optimal for multi-core processors) or LZMA
To make the archive secure, you must use . Password: Use a strong, complex passphrase. BTB.7z