Inside baseball (metaphor) : It usually refers to a detail-oriented approach to the minutiae of a subject, which in turn requires such a specific knowledge about what is being discussed that the nuances are not understood or appreciated by outsiders.
Security professionals are a detail-oriented bunch. It goes with the territory, but as the person making the financial decisions, it’s important to know the high-level concepts when they are making a case for why you should spend more money on security.
This brings us to Red Teams and Blue Teams.
It’s pretty simple. These are the basics. There are nuances and not every strategy follows these concepts exactly.
An external team that tries to infiltrate, Phish, and tests your security program. Sometimes referred to as penetration testing, but that’s a more specific set of tasks. The red team may use social engineering, network attacks, vulnerability attacks and the like to defeat your security. It’s important to note that this isn’t just merely testing how strong the wall is you’ve built. Often your security is weakest inside that wall you’ve spent so much time building.
The (often) internal security team that defends against the Red Team. But also the real attackers. Depending on the organization, this may be a separate team from your regular security team or made up of some of those members. The primary goal of this is to assume you’re ALWAYS being attacked and defend against this by refining security processes.
Remember that security doesn’t mean just building a bigger wall. Security is a process that needs constant attention and starts from the inside out.