Replying to Avatar Dr. Hax

Hello. What do these two traces go to?

#m=image%2Fjpeg&dim=1080x1440&alt=A+small+USB+device+that+has+two+traces+from+a+couple+of+pins+highlighted.+They+go+to+two+header+pins+that+appear+to+go+through+to+the+other+side+of+the+board.&blurhash=_MI5D1Ri%7E8V%5DtRaMNL%7EWs.NIf%2BRjWCs.%3FFj%5DIpt6WDoxobWSW%3BWGV%5Bo0oej%3FR%24j%5Bs%3BWUk9jbWBohofadWUkCbFj%5DRRWUt6ogWBbFazt8fPRifks%3Be%3BWCV%40WCozkAafj%5DbX&x=9ebdf1cd1b64c981e38a654c8a21a7257b3d9d599b984e7fdacf60b8dbb5105a

Oh, just some header pins. I wonder what those are for...

#m=image%2Fjpeg&dim=1080x810&alt=The+opposite+side+of+the+previously+pictured+USB+device.+Here+we+can+see+that+it+is+a+Signet+v1.3+device.+From+this+angle+we+can+see+that+it+is+two+male+header+pins+that+were+connected+to+those+traces+from+the+other+side+of+the+PCB.&blurhash=%23HECwb4.-VICxtIoxtbIR%23XUIXM%7BoeRkofofaxs%3A%7EAaOSekRR*xuR*n%2CnnMxRjWWjvofj%5BaxWBkC-mV%7BS4koj%5DaKj0kSSdWAocWFkDoLV%40ozkVWBtRWTRRWEj%3Dayj%3Fj%5Boe&x=abd52f7ff9d8e43e76108f32797f1a12dae604bc8bef43b1f17a4e256062ed0f

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Autumn Sun ☀️🌘☯️ 1y ago

Signet 1.3?

Are those for an external antenna?

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Dr. Hax 1y ago

Good guess, but no. There's no wireless anything in these devices. It's how people can be confident that if it didn't leave the devicr via USB, then it didn't leave the device at all.

This makes security auditing easier since there's only one code path to investigate.

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