Configuring Token Authorization With aspera.conf

Requirements:

You have created a transfer user on your server.
You have set up the transfer user with an SSH public key as described in Setting Up Token Authorization.

The examples below use a transfer user called asp1.

Locate aspera.conf and open it with a plain-text editor
```
/opt/aspera/etc/aspera.conf
```
Add an authorization section for the user
In the following example, the user section for asp1 contains an <authorization> section that specifies the following:
- a <transfer> section specifying that both incoming and outgoing transfers (in and out) should use token encryption
- a <token> section with an encryption key, which should be string of random characters (at least 20 recommended)
Alternatively, you can configure token-authorization settings in a <group> section to be applied to all users in the group. Or, you can configure the settings in the <default> section to apply them globally for all users.
```
<user>
    <name>asp1</name>
        <authorization>
            <transfer>
                <in>
                    <value>token</value>
                </in>
                <out>
                    <value>token</value>
                </out>
            </transfer>
            <token>
                <encryption_key>gj5o930t78m34ejme9dx</encryption_key>
            </token>
        </authorization>
        <file_system>
              ...
              ...  
        </file_system>
    </name>
</user>
```