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Good news, the open source pulseview software contains a lot of decoders including UART. So I guess it can be the most used asynchronous bus protocol: UART Only one microcontroller on each of them.Īccording to the datasheet, main communication protocols used with this microcontroller are SPI and I☬.īut not this time, cause both of them need a clock signal, and there is no movement on any of the other wires. So let's take a look at the chips on boards. This safe is not open hardware or software, so we don't know how it works.
#Problem in opening digital sentry safe full
To decode the full signal, we have to find the protocol used. We can see on the captured signal 5 repetitions of the same shape in a row, so we can assume that matches our "1" key pressed 5 times. Black is always low, yellow & red are always high (so colors are respected). Result : only green wire has changing signal. This kind of electronic safe needs a 5 digits code, so for the first cature I will just press the "1" key 5 times. We can inspect circuit tracks to find the wire mapping, but as my new logic analyser can cature 8 channels, let's just plug each wire in. As the color of wires are not always respected, let's assume that we don't trust them.
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1x inside with memory & solenoid (who mechanically unlock the bolts)īetween these two boards, there are 4 wires (black, yellow, green & red).1x outside with batteries, keypad, leds & buzzer.Start by disassembling the door to take a look inside. I just bought a logic analyser, what can I do with it?
#Problem in opening digital sentry safe Patch
I created an alternative PCB and firmware to patch this issue, available here Story The company was notified but never responded.
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A vulnerability allows opening electronic safes from the Sentry Safe and Master Lock company without any pin code.