When you delete a file are not really deleted, only with secure delete you can be sure that nobody can recover your files. To add secure delete in nemo contex menu to easy wipe any file you want you must:
1.Install wipe from pacman repo. sudo pacman -S wipe
2. go to : home/your username/.local/share/nemo/actions directory.
3. make a shred.nemo_action text file.
4. copy paste the follow and save it.
[Nemo Action] Active=true Name=secure delete file Comment=Overwrite and delete object Exec=/usr/bin/shred -f -u -v -z -n 1000 %F Selection=any Extensions=any EscapeSpaces=true
At the field Name=secure delete file you can chance the bold words to your local languish.