Someone Just Broke RSA Faster Than Anyone Expected. Your 2026 Marketing Plan Should Move That Fast Too

Old Math, New Problem

Researchers demonstrated a way to forge 1024-bit RSA signatures in September 2026 without factoring the underlying keys. That's a meaningful break from how cryptographers assumed RSA would fail. Not through brute-force factoring getting faster, but through a shortcut nobody built defenses against because nobody expected the attack to come from that angle.

The lesson isn't about encryption. It's about how systems break.

Most operators assume the ground shifts slowly enough to notice. You watch for the thing you're already worried about, and the thing that actually gets you comes from somewhere you weren't looking.

Marketing teams are doing the same thing right now with their 2026 plans. Ask a CMO what's changing their strategy and you'll get an answer about AI recaps, chatbot search, or whatever tool demo they saw last week. Meanwhile the actual shifts, the ones already showing up in agency contracts and media budgets, are getting almost no attention in planning meetings.

That gap is the problem. Not that AI isn't real. It's that operators are spending their planning cycles on the assumption everyone's already talking about, while the assumptions that quietly broke months ago sit unexamined. Agency structures, billing models, and channel mix have already moved. Most 2026 plans haven't caught up.

The Contract Reviews Nobody's Talking About

85% of US B2C marketing executives plan to review their media agency contracts in 2026. That number comes out of Forrester's 2026 agency predictions, published in September, and it hasn't gotten anywhere near the attention it deserves in planning conversations.

Think about what that percentage actually means. If you're one of the businesses currently locked into a retainer, the odds are overwhelming that your counterpart on the agency side is already fielding questions from other clients about scope, pricing, and value. The review isn't hypothetical. It's already underway somewhere in your industry, and agencies know it.

Forrester also predicts 15% of US agency jobs get eliminated to automation in 2026. Read those two numbers together and the operational picture gets clearer. Agencies aren't just facing pricing pressure from clients who want to renegotiate. They're simultaneously cutting the headcount that used to justify the retainer in the first place.

For anyone currently on a retainer, this is the moment to ask what you're actually paying for. Media buying that's increasingly automated? Reporting that could run through a dashboard? Strategy work that genuinely requires a human relationship? Those are three different line items, and 85% of your peers are apparently asking the same question right now.

Where the Billings Are Actually Going

Principal media is expected to grow to nearly 33% of total agency billings in 2026. If that term isn't already in your vocabulary, it should be. Principal media is when an agency buys media inventory on its own account, often at a negotiated rate, then resells it to you as part of the campaign. The agency isn't just planning and placing your buy anymore. It's sitting on one side of the transaction as a media owner, and on the other side as your advisor.

That's a different relationship than the one most contracts were written to describe.

None of this means principal media is a bad deal. Bulk-rate inventory can genuinely lower your cost per impression. But the markup structure and the incentive to route your budget through the agency's own inventory rather than the open market are things you should be able to see, not infer.

Separately, 38% of marketers plan to increase retail media investment in 2026. That's a real channel with real audience data behind it, and it's growing for good reason.

Put those two numbers next to each other and the question for any operator becomes simple. Ask your agency directly how they're billing your media right now, what they own versus what they're placing, and where your retail media dollars actually land.

Creators and Owned Channels Over Recaps

61% of marketers plan to increase investment in content creators in 2026, according to Kantar's Marketing Trends report published in September. Put that next to the agency and principal media numbers from the last two sections and a pattern shows up. Budget is moving away from arrangements where you don't fully see the incentives, and toward relationships that are direct.

A creator relationship is direct in a way an agency retainer often isn't. You know what you're paying for, you know who's making the content, and you're not wondering whether your media dollars are routing through someone's own inventory.

The same logic applies to owned channels. Email lists, communities, direct audiences you actually control. When agency contracts are getting reviewed by 85% of your peers and billing structures are shifting underneath long-standing relationships, the channels you own outright are the ones nobody can renegotiate out from under you.

This week, the concrete move is small. Pull your email list growth numbers for the last quarter and compare them against your paid reach on any platform where an algorithm decides who sees you. If your owned audience is flat while your paid spend has been carrying the weight, that's the gap to close before your 2026 plan gets locked in.