In MX 18.1, its easy to check the integrity of downloaded iso files. You have a few options.
If you have a iso file, open up the Thunar file manager and right-click the iso. Select “Compute sha/md5sum” (if you don’t see that command, see note at bottom of page):
This will generate a window like this with the md5 and the sha256 hash values for the iso. You can compare those with published verification keys.
If you are supplied with a checksum file ( *.sha file or a *.md5) file, you can also check directly by having the file and the iso in the same folder, then right click the *.sha or *.md5 file and select “Check data integrity”.
This will check the iso against the previously generated number contained in the checksum file, and give you a quick Ok if the files match.
You can also manually generate a checksum via terminal commands.
You can then use these values to compare against data published by the makers of the iso.
**Note: earlier versions of MX only compute md5sums via the thunar right-click actions. For versions from MX-17.1 on that were upgraded to MX-18.1, click Menu > MX Tweak > Config Options tab, and check the box “Reset Thunar custom right-click actions to system defaults.”