PostgreSQL offers many ways for users to administer and control incoming connections to a given instance with a large catalog of options available like BSD, LDAP and password-based, etc. Depending on the deployments and the security expectations though, each method comes with its set of advantages for PostgreSQL. At the end it comes to how much complication and how much gain an option can have compared to another from a security point of view. This presentation presents the catalog of options available to users, focusing on how to take advantage of one method or another depending on the deployments done and what are the expectations looked for. Are also presented the latest features related to authentication that have been added recently in PostgreSQL 11.