= Safe passwords == References * [=#point1 (1)] [https://smile.amazon.de/Hardening-Hostile-Networks-Software-Development/dp/0134173260/ref=sr_1_fkmrnull_1?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&keywords=hardening+linux+in+hostile&qid=1553792212&s=gateway&sr=8-1-fkmrnull Kyle Rankin: Hardening Linux in Hostile Networks.]