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by Domenic_S
473 days ago
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> they are just using a "normal" BLE address and then reverse-engineering a key from that. It's really clever - the BLE spec limits message size, so Apple uses the BLE address as part of the message (the first part of the public key). But since the public address of a BLE chip has 24 bits of "Company ID" (similar to MAC addresses I guess?), and the registry records are public, they were able to precompute a bunch of public/private keypairs. |
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