What Is Application Security?

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Application security is about making software resilient from attack by adversaries who already have access, not just keeping outsiders out. That distinction shapes everything else in this learning center: the goal isn’t a perimeter you defend once, it’s software that stays trustworthy even when an attacker gets a foothold.

This has been core to how Rietta approaches software since the company’s earliest days running web hosting and infrastructure in 1999, security-adjacent work before application security had the name it does now. Our Audit & Attestation work finds where that trust breaks down in a real application, and our Technical Solutions team fixes it, whether that means hardening an existing Rails or Django app, reviewing third-party dependencies, or building security requirements into a team’s process from the start.

If the two-minute version here isn’t enough, Practical Application Security for Developers is our free hour-long course covering this in full. For ongoing reading, Rietta’s cybersecurity coverage is where we write about this in practice.