Pour chiffrer les password dans les settings maven:

$ mvn --encrypt-master-password
Password:
{jSMOWnoPFgsHVpMvz5VrIt5kRbzGpI8u+9EF1iFQyJQ=}
$ cat << EOF >> ~/.m2/settings-security.xml
<settingsSecurity>
      <master>{jSMOWnoPFgsHVpMvz5VrIt5kRbzGpI8u+9EF1iFQyJQ=}</master>
</settingsSecurity>
EOF
$ mvn --encrypt-password
Password:
{COQLCE6DU6GtcS5P=}
$ cat << EOF >> ~/.m2/settings.xml
<settings>
...
    <servers>
    ...
        <server>
            <id>my.server</id>
            <username>foo</username>
            <password>{COQLCE6DU6GtcS5P=}</password>
        </server>
    ...
    </servers>
...
</settings>
EOF