Apple Support docs show that unusual mid-production hardware changes were made to its A12, A13, and S5 chips last fall, to update the Secure Storage Component
Context & Ripple Effects
This lands just months into Apple's first Apple Silicon Mac ramp, but the chips touched here are the ones already in hundreds of millions of pockets: the A12, A13, and the S5 watch chip. Apple Support documents quietly confirm that last fall Apple revised these parts mid-production specifically to update the Secure Storage Component — the hardware root that holds device secrets.
The significance is procedural more than product: silicon is normally frozen once a generation ships, and security fixes ride the next annual chip. Revising three shipping chips simultaneously inside one production run means Apple treated the storage-of-secrets path as urgent enough to break its own cadence — and disclosed it only in support documentation, not a keynote.
First-order effects
- Devices assembled after the fall revision ship with an updated Secure Storage Component under identical model names, so buyers and the refurb/repair channel receive two hardware variants of the 'same' A12, A13, or S5 device with no external way to tell them apart.
Second-order effects
- The move prefigures the pressure Apple now faces at the silicon level: the later SLAP and FLOP side-channel attacks against M-series and recent A-series chips show exactly the class of vulnerability that can only be answered by changing the die itself, not a software patch.
Third-order effects
- If mid-run security respins become routine, a chip's identity stops being fixed by its part number — which pushes provenance and verification of what silicon is actually inside a device toward being a first-class concern, something Apple's full-stack control makes far easier for it than for merchant chip vendors whose customers buy dies on spec sheets.
The trend: Silicon security is shifting from a per-generation design task to an iterative one, where Apple increasingly revises chips already in production rather than waiting for the next annual part.