B.2.安全性参考文献

• The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall, Third Edition, published by No Starch Press, 2014. ISBN: 978-1593275891

• SSH Mastery: OpenSSH, PuTTY, Tunnels, and Keys, Second Edition, 2018. ISBN: 978-1642350029