You can still create ZIP files with the legacy encryption used instead (default behavior), less secure but compatible with the bundled macOS archiver. But that does not mean it is a proprietary format of Keka, just macOS does not support AES-256 ZIP yet.
For example, a ZIP file encrypted with AES-256 cypher (not the default option) will not be recognized by macOS without a third party app (like Keka, but not limited to). The app supports 7Z, ZIP, TAR, GZIP and BZIP2, lets you password protect files, and split files by size suitable for writing to a CD. Note that Keka produces files that are universal, no need to use Keka in the other hand. Keka is a paid Mac app that handles the usual file compression and extraction functions, and can also create and open password protected files (provided you have the password this isn’t for cracking passwords). Divide files and protect them with a password is now a kids game. With Keka you can compress as many files as you want in a bunch of formats. Good thing it's really inexpensive, but I can't why is anyone at all happy about it. Keka 1.2.16 MAS Multilingual macOS Keka is a full featured file archiver, as easy as it can be. you have to tell the recipient to purchase a copy for themselves? gee. Currently it works on Windows, Mac, Linux and Android moreover B1 Online Archiver allows you to uncompress. Also Keka can extract lots of compressed files, from ZIP and 7Z to RAR archives, even parted ones. Just drop the files you want to compress to the Keka icon in the Dock or the main window. Enter the password that was specified when compressing the file originally with Keka then click Done. If a password was set when zipping the original file, you will now be prompted to enter the password in order to complete the extraction process.
Divide files and protect them with a password is now a kids game. To extract a zipped file using Keka, right-click on your zipped file and click Extract using Keka.
Password protection is tricky on Mac, but with this it's even worse - sure you can pass-protect a file, but you need to have keka to decompress it later, so. With Keka you can compress as many files as you want in a bunch of formats. You can zip and unzip files on Mac with just the system tools, so no need to use this one