add things resources from the last 5 years over machines

gpg/README.md

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+## gpg shortcuts
+
+<br>
+
+(adapted from [bt3gl's 20216 guide](https://coderwall.com/p/ajtlqa/getting-started-with-pgp-gpg))
+
+
+1. create a key (choose RSA with 4096):
+
+```
+gpg --full-generate-key
+```
+
+<br>
+
+2. share the public key with:
+```
+gpg --armor --export > public-key.asc
+```
+
+<br>
+
+3. upload to some keyservers, such as ubuntu or MIT:
+```
+gpg --send-keys --keyserver keyserver.ubuntu.com KEYID
+gpg --keyserver hkp://pgp.mit.edu --send-key KEYID
+```
+
+<br>
+
+4. backup the private key:
+```
+gpg --export-secret-keys --armor KEYID > priv.asc
+```
+
+<br>
+
+5. list your keys:
+```
+gpg --list-keys
+gpg --list-secret-keys
+```
+
+<br>
+
+6. clean up if needed:
+```
+gpg --delete-secret-key KEYID
+gpg --delete-key KEYID
+```
+
+<br>
+
+7. finally, you should upload your key into official servers such as **[ubuntu](https://keyserver.ubuntu.com/)** or **[mit](https://pgp.mit.edu/)**.
+
+
+
+