Add 'Moving or copying GPG keys'

Moving-or-copying-GPG-keys.md

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+# Moving or copying GPG keys
+
+1. Export the keys
+
+       $ gpg --export-secret-keys -a > my_private_key.asc
+       $ gpg --export -a > my_public_key.asc
+
+2. Import the keys
+
+       $ gpg --import my_private_key.asc
+       $ gpg --import my_public_key.asc
+
+3. Trust the imported key
+
+       $ gpg --edit-key ‹insert mail here›
+       Command> trust
+       # trust ultimately
+
+---
+
+Source: https://www.phildev.net/pgp/gpg_moving_keys.html