2026-02-23 15:00 UTC
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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@stf@chaos.social 2026-02-23 15:05
another interesting detail with this SBT #military #crypto #device #backdoored by the #nsa is that it contains a weird virtual machine, this handles templating of messages and fixed point math, and uses only 2 data "registers" and a pointer register.