In this article, we will introduce the Linux packet filtering firewall called firewalld that comes default in Redhat distributions Fedora/CentOS. Here is the link to the article:
Introduction to Linux firewalld
Enjoy 
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Category: Security
Shamir’s Secret Sharing Unraveled
In this article, we unravel the concept behind Shamir’s Secret Key Sharing through mathematical equations and examples and conclude with a demonstration in Python. Here is the link to the article:
Shamir’s Secret Sharing Unraveled
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Exploring SSL/TLS – Part 3
Exploring SSL/TLS – Part 2
Exploring SSL/TLS – Part 1
How Kerberos Authentication Works
Here is the link to the article introducing how Kerberos works (at a high level):
How Kerberos Authentication Works
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Secure Data Communications Using GNU Privacy Guard (GPG)
Here is the link to the article introducing how one can leverage GPG for secure communication:
Secure Data Communications Using GNU Privacy Guard (GPG)
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