AAA Modernization: How to Build a CISO-Ready Security Business Case

 This cost of standing still has been priced. In principle, the budget committee has agreed. The legacy AAA platform replacement is on the roadmap. It then reaches the security architecture review, which raises questions unrelated to cost. What's today's exposure? Which controls are changed? What risk remains afterwards, and who is responsible?

This is a different document. Not the finance case with the word "risk" pasted on top. A CISO evaluates residual risk; cases not written with this in mind often stall.

The new guide explains how to build one. It is organised around three key areas a security team evaluates: attack surface, compliance and audit exposure, and detection and containment speed. For each area, compare the legacy platform's impact, the modern platform's effect, and the specific control that drives change.

There's a worked scoring row in there, using a credential-stuffing run against the broadband realm, so you can see what a scored scenario looks like before and after. There's also a piece of advice you won't hear from many vendors. Leave unchanged rows in the table. Security leads trust comparisons that include unchanged rows more than those where all areas improve.

It also covers an often-skipped aspect. Someone will ask about the migration's exposure, so have the transition plan and a named owner for any remaining register entries ready.

One key point: start with the risk register entry, not the platform. If the legacy AAA is an accepted exception, renewed annually, use that as your starting point.

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