Port Knocking: Secure Infrastructure Through Clever Firewall Logic
Firewalls aren't foolproof but can be cleverly used with Port Knocking, a method that gives authorized users secret steps to gain access by temporarily opening ports for a limited time.
Introduction It's undeniable that the only truly secure system is one that's powered off. But let me tell you, you might as well throw that system away, because from the birth of the internet, every system has been created for a purpose—and that purpose forces it to be exposed publicly and made available to external users, whether it’s for patching, transmitting data, or enhancing functionality. This exposure may be selective, or it may not be, because some systems must be accessible to anyone, from anywhere. The dilemma that comes to mind now is: if anyone can access such systems, then where...