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  • I can see this on the manpage for gpg 1.4.18, however it seems absent from the manual for gpg 2.0.28. Additionally, on both versions, the command "gpg -k --list-options show-usage 1A3ABKEY" outputs "gpg: unknown option `show-usage'" Commented Oct 17, 2015 at 8:28
  • @YoungFrog. Thank you for the comment. I clarified I found the info in the info pages. As for the command not working, for me it works on gpg (2.1.8). When I try gpg1 (1.4.19) I do also get gpg: unknown option 'show-usage' gpg: invalid list options Although its usage is documented in the gpg1 info pages... Commented Oct 18, 2015 at 18:44
  • But what exactly is certify vs. authenticate? Where is the difference, which does what? Commented Jul 31 at 14:36