Make sure that sensitive data is never written unencrypted.

It is better to write an empty buffer to the file instead.

plugin/gnupg.vim

@@ -436,11 +436,13 @@ function s:GPGEncrypt()
   let &shell = s:shellsave
   call s:GPGDebug(1, "called gpg command is: " . "'[,']!" . s:GPGCommand . " --quiet --no-encrypt-to " . options . " " . s:stderrredirnull)
   if (v:shell_error) " message could not be encrypted
-    silent u
+    " delete content of the buffer to be sure no data is written unencrypted
+    " content will be recovered in GPGEncryptPost()
+    silent normal! 1GdG
+
     echohl GPGError
     let blackhole = input("Message could not be encrypted! File might be empty! (Press ENTER)")
     echohl None
-    bwipeout
     return
   endif