Add docs on how to encrypt messages to be sent to 2i2c support

2i2c-org/infrastructure#1698 is
the equivalent for engineers

Fixes 2i2c-org/infrastructure#639

admin/howto/encrypted-support.md

@@ -0,0 +1,34 @@
+# Send `[email protected]` encrypted content
+
+Sometimes community representatives need to send us *encrypted* information -
+usually credentials for cloud access or an authentication system. We use
+[age](https://age-encryption.org/) (pronounced *aghe*) to allow such information to
+be encrypted and then sent to use in a way that *anyone* on the team can decrypt,
+rather than the information be tied to a single engineer. You'll be directed to this
+page by 2i2c support if we require something encrypted from you.
+
+This page describes how you can encrypt information and send it to us!
+
+1. [Install age](https://github.com/FiloSottile/age#installation) on your computer.
+   On a Mac, if you are using `homebrew`, you can simply `brew install age`. On Linux,
+   your package emanager should have `age`, and on Windows you can find binaries to download
+   [from the releases page](https://github.com/FiloSottile/age/releases). See
+   [all installation options](https://github.com/FiloSottile/age#installation)
+2. Run `age -e -r age1mmx8hfzalmn3tmpryrfvcud5vyfakxdfqe683r40qkr6pjd2ag6s72cat5 -a` on
+   your terminal, and paste the contents of the message you want to encrypt. Press enter,
+   then `Ctrl-D`. Make sure to copy this exactly!
+3. `age` will print the encrypted version of your message on your terminal, and it'll look
+   something like this:
+
+   ```
+   -----BEGIN AGE ENCRYPTED FILE-----
+   YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSAzOW1zTEwrM0FOZ2dWQUo0
+   bks2WlZ0eU5LclRVNW4wcEZzRngyT0NSUkRjCm5oR0hGbzV0ZXJ4ZE0xQkdqSXFY
+   WkoxaWI4VWQvd3pNbnpiR1BjTnNwREkKLS0tIHpLRXorOWlsS2pFWHFiK1JqUW8v
+   U1pyYW40QSswcFNRZnBDcDcwN29EeVUKC5temNTLqJPd5oT0kfOOK2UHGgb2IVzK
+   zZS5QmYxmbRNa7qRGqbL
+   -----END AGE ENCRYPTED FILE-----
+   ```
+
+4. Copy the encrypted version of the message and include it in the message to `[email protected]`.
+   All 2i2c engineers will be able to decrypt the message!

index.md

@@ -44,6 +44,7 @@ admin/howto/content
 admin/howto/manage-users
 admin/howto/control-user-server
 admin/howto/data
+admin/howto/encrypted-support
 admin/howto/replicate
 admin/howto/create-billing-account
 admin/topics/network