Keka is capable of compressing Zip files using AES cypher. By default it uses Zip Legacy 2.0, since is the most supported on all systems.

To enable AES cypher, open the Terminal.app and type this command:

defaults write com.aone.keka ZipUsingAES TRUE

To disable AES cypher, open the Terminal.app and type this command:

defaults write com.aone.keka ZipUsingAES FALSE

Remember to apply those command with Keka closed. Also note that 7z files are always encrypted using AES, so maybe you don't need to use this trick, just use 7z format instead when possible.

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