Air Filter DRM? Hacker Opts Out With NFC Sticker

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[Flamingo-tech]’s Xiaomi air air purifier has a neat security characteristic: it can refuse to run if a filter wants alternative. Of course, by “neat” we imply “annoying”. Especially when the air purifier positive appears to guage a filter to be ineffective a lot sooner than it ought to. Is your atmosphere comparatively clear, and the filter nonetheless has legs? Are you utilizing a secondary pre-filter to increase the precise filter’s life? Tough! Time’s up. Not solely is that this inefficient, nevertheless it’s wasteful.

Every Xiaomi filter comprises an NTAG213 NFC tag with a singular ID and makes use of a singular password for communications, however how this password was generated (and due to this fact the best way to generate new ones) was not recognized. This meant that appropriate tags acknowledged by the air purifier couldn’t be created. Until now, that’s. [Flamingo-tech] has shared the discovery of how Xiaomi generates the password for communication between filter and purifier.

A small NFC sticker is now all it takes to have the air purifier acknowledge a filter as new.

[Flamingo-tech] has lengthy been a proponent of fooling Xiaomi purifiers into appearing in another way. In the previous, this meant putting in a modchip to hijack the DRM course of. That’s a traditional methodology of getting round nonsense DRM on issues like label printers and dishwashers, however on this case, reverse-engineering efforts paid off.

It’s now potential to create easy NFC stickers that play by all the precise guidelines. Is a filter’s time up in accordance with the NFC sticker, nevertheless it’s clearly nonetheless good? Just peel that NFC sticker off and slap on a brand new one, and so far as the air purifier is anxious, it’s a brand new filter!

If you’re within the reverse-engineering journey, there’s a GitHub repository with all the information. And for these desirous about buying appropriate NFC stickers, [Flamingo-tech] has some available for sale.

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