2026-02-23 12:19 UTC
The #NSA with the help of #philips #backdoored (again!) a european military messaging #device in the 80ies, a few years ago the fine people of the #cryptomuseum published everything they knew about it - including a #firmware dump:
https://www.cryptomuseum.com/crypto/philips/ua8295/
back then i #reverseEngineered this, and last week finally cleaned it up, and publish it today:
https://rad.ctrlc.hu/nodes/rad.ctrlc.hu/rad:z46AkAERuXAzqZcDRKvE7byRbkga1
also on the bad site: https://github.com/stef/UA-8295-NSA
update: it's a thread: 1/n
Replies (2)
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@stf@chaos.social 2026-02-23 15:00
some interesting details, the #nsa #backdoored #phillips device runs a 8051 mcu. there's a print subroutine, that pops the return address from the stack, and prints the litteral chars from that address onwards until it finds a byte which has the top bit set. then it returns to the address after this last char. of course this is no calling-convention that any disassembler knows, so it throws them off. 2/n
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@Xilokar@mamot.fr 2026-02-23 13:12
@stf@chaos.social Oh, I see you name function same as me: char maybe_checksum(char *param_1,... 😅