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   Ryan Castellucci (they/them) :nonbinary_flag: (ryanc@infosec.exchange)'s status on Tuesday, 31-Dec-2024 02:18:52 JST Ryan Castellucci (they/them) :nonbinary_flag:

   Wow, I just found a bit of code that claims to transmit a DCF77-compatible ("atomic clock") radio signal from a microcontroller using PWM.

   This seems like a terrible idea.

   • Embed this notice
     ../kajer/. (kajer@infosec.exchange)'s status on Tuesday, 31-Dec-2024 02:37:33 JST ../kajer/.

     in reply to

     @ryanc I can think of a few legit uses for a signal like this, since my atomic clocks get signal at ~2am only.

     On the otherhand... a time based "CTF challenge" seems neat.

   • Embed this notice
     Ryan Castellucci (they/them) :nonbinary_flag: (ryanc@infosec.exchange)'s status on Tuesday, 31-Dec-2024 22:53:34 JST Ryan Castellucci (they/them) :nonbinary_flag:

     in reply to

     • Marko Karppinen

     @karppinen lolsob

   • Embed this notice
     Marko Karppinen (karppinen@mastodon.online)'s status on Tuesday, 31-Dec-2024 22:53:35 JST Marko Karppinen

     in reply to

     @ryanc there's an app that does this for the Flipper Zero too. Also various iPhone and Android apps that use harmonics from the speaker or headphone jack to do it.

     I have a JJY (the Japanese equivalent to DCF77) wall clock on which it's super cumbersome to set the time manually. I’ve tested one of the apps with and they seem to work great!