Encryption keys menu style

src/freedombone-controlpanel-user

 function menu_encryption_keys {
     while true
     do
-        data=$(mktemp 2>/dev/null)
-        dialog --backtitle $"Freedombone User Control Panel" \
-               --title $"My Encryption Keys" \
-               --radiolist $"Choose an operation:" 19 70 11 \
-               1 $"Show your PGP/GPG key" off \
-               2 $"Show your full PGP/GPG key, including private key" off \
-               3 $"Publish your PGP/GPG key so that others can find it" off \
-               4 $"Add someone's PGP/GPG key" off \
-               5 $"Remove someone's PGP/GPG key" off \
-               6 $"Sign a PGP/GPG key or website domain" off \
-               7 $"Refresh your PGP/GPG keys" off \
-               8 $"Add an ssh key for logging in" off \
-               9 $"Remove an ssh key for logging in" off \
-               10 $"Set the trust level for a PGP/GPG key" off \
-               11 $"Back to main menu" on 2> "$data"
-        sel=$?
-        case $sel in
-            1) rm -f "$data"
-               break;;
-            255) rm -f "$data"
-                 break;;
-        esac
-        case $(cat "$data") in
+        W=(1 $"Show your PGP/GPG key"
+           2 $"Show your full PGP/GPG key, including private key"
+           3 $"Publish your PGP/GPG key so that others can find it"
+           4 $"Add someone's PGP/GPG key"
+           5 $"Remove someone's PGP/GPG key"
+           6 $"Sign a PGP/GPG key or website domain"
+           7 $"Refresh your PGP/GPG keys"
+           8 $"Add an ssh key for logging in"
+           9 $"Remove an ssh key for logging in"
+           10 $"Set the trust level for a PGP/GPG key")
+
+        # shellcheck disable=SC2068
+        selection=$(dialog --backtitle $"Freedombone User Control Panel" --title $"My Encryption Keys" --menu $"Choose an operation, or ESC for main menu:" 14 70 7 "${W[@]}" 3>&2 2>&1 1>&3)
+
+        if [ ! "$selection" ]; then
+            break
+        fi
+
+        case $selection in
             1) show_gpg_key;;
             2) show_full_gpg_key;;
             3) publish_gpg_key;;
             8) add_ssh_key;;
             9) remove_ssh_key;;
             10) gpg_key_trust;;
-            11) rm -f "$data"
-                break;;
         esac
-        rm -f "$data"
     done
 }