The OSI Model & TCP/IP Model
The Open Systems Interconnection (OSI) model is a generic reference to understanding how computers communicate with each other. It's not meant to be an exact science, but rather a guide to help us visualize what happens during node-to-node communication. I once made a post on the OSI model before, but it was lacking detail. There ...
How Does DHCP Work?
Dynamic Host Configuration Protocol, or DHCP, is used to provide quick and centralized management of IP addresses and other TCP/IP settings on your network. These are things like host IP address, subnet mask, DNS settings, default gateway address, and so on (I call these "IP configuration settings"). When you power on your computer, a DHCP ...
Firewalls: A Fundamental Introduction
The defense in-depth design is a security philosophy that proposes we protect our assets and networks with multiple levels of security. The idea is not strictly limited to technical security controls, as management and operational controls have their rightful place in the defense in-depth approach. However, many aspiring and enthusiastic young learners falsely attribute the ...
Twitter Urges Its Users to Change Their Password Immediately
Thursday afternoon, Twitter discovered a bug in its systems that revealed plaintext passwords. Passwords are usually stored as a "message digest," which is the result of a one-way cryptographic hash function, such as SHA-256. This prevents unauthorized parties from seeing the actual password. The bug was discovered when Twitter detected an internal log displaying the ...
Volkswagen Golf GTE And Audi3 Sportback e-tron Car Models Vulnerable to Remote Hacking
Hacking vehicles isn't anything new. Over recent years, researchers have demonstrated through proof-of-concept experiments that many popular car models can be hacked by exploiting carefully selected vulnerabilities for a particular system integrated into the vehicle. Just ask Ford, Jeep, Nissan, and Toyota. Some of these vehicles can be remotely turned off; some of them can ...
The Cybersecurity Man 