I don’t profess to be an expert programmer or a skilled security researcher, but I’ve spent a lot of time over the last dozen plus years working on recovering old passwords in StuffIt archives. StuffIt was the popular compression tools for Mac users until the Mac OS X-era, when it was overtaken by the standard ZIP format (and price per gigabyte of storage reached a point where compression just wasn’t as critical). You can still purchase Stuffit Deluxe 2011 for both Windows and Mac, but for most people there will never be a need.