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Danke an alle, die uns beim Norddeutschen Funktag an unserem Tisch und im Vortrag zum POCSAG-Pager-Projekt besucht haben!
Es war eine wirklich schöne Veranstaltung mit guten Gesprächen und interessantem Austausch.
10/10 would assembly here again.
Wir freuen uns aufs nächste Event :)
Morgen, 31.5., sind wir an der TUHH (Gebäude A) in Hamburg-Harburg und machen eine kleine Assembly beim Norddeutschen Funktag — im Raum oben schräg gegenüber vom Flohmarkt.
Bei uns gibt es Pager/POCSAG und voraussichtlich auch ein wenig Meshtastic, also besucht uns gern oder grüßt mal auf Long Fast :)
Den Vortrag zu unserem selbstgebauten Pager gibt es am 31.5. um 11:30 Uhr noch einmal live, in Farbe und auf Deutsch — beim Norddeutschen Funktag an der Technischen Universität Hamburg.
Antwortete im Thread
@kallemp I did in fact already thought about a similar project and device.
- As for the anonymous reading / recieval: Using license-free #ISM bands like 27MHz #CB radio to send messages & then recieving them like a #pager would work, only making the transmitter detectable during trabsmission via triangulation, which may have a too narrow window of a few seconds given #OTP doesn't have #PGP-Style overhead. Making it feasible for using #POCSAG even...
I merely focussed on airgapped data transfers as being able to do OTP encryption wasn't feasible until the advent of legitimate 1TB microSD cards and thus negligible impact on key logistics, to even then one could update those OTA in a broadcast encrypted with per-user-/device-keys if that's feasible.
GitHubGitHub - KBtechnologies/PocketCrypto: An airgapped encryption/decryption device for off-grid communicationAn airgapped encryption/decryption device for off-grid communication - KBtechnologies/PocketCrypto
EasterHegg was fun and we had many great conversations about our pager project (and adjacent nerdy topics)!
If you didn't meet us there — or visited our table and would like to learn more —, the next opportunity to meet us is going to be at Norddeutscher Funktag, a ham radio event at Hamburg University of Technology.
#EasterHegg #EH22 #NorddeutscherFunktag #Amateurfunk #HamRadio #radio #DL0TUH #Funkttag #NF25 #Hamburg #TUHH #HamburgUniversityOfTechnology #pager #POCSAG
There are always more features to implement and bugs to fix ... no egg-ception even on a Sunday at #EH22
Firmware testing at Kampnagel on day 0 of #EH23
We're planning to transmit with the following RICs:
8 Sender-ID (DL0TUH)
1111 Info
1122 Tests
1142 Eventinfos
2504 Date & Time (Skyper)
Want to read what we are broadcasting?
You can receive our transmissions at EasterHegg if you bring your own pager tuned to 439.9875 MHz :)
Monday morning commute, time for some more pager firmware development — extending RadioLib and debugging.
Hello world!
We are the work group "Signalspielplatz" ('signal playground') from Northern Germany.
We brought our first prototype of a DIY POCSAG pager and transmitter to #38c3, where we took the opportunity to test the setup under congress conditions, as well as present the pager (link down below).
Our next step will be to test an improved prototype at EasterHegg 22. More updates and a website coming soon, so follow us to stay informed.
https://events.ccc.de/congress/2024/hub/en/event/paging-38c3-how-we-built-an-in-complete-diy-pocsag/
38c3[38c3] Chaospager: How we built an (in-)complete DIY POCSAG Infrastructure for 38c3From the initial idea of bringing a POCSAG Transmitter to Congress, to constructing our own custom pager based on ESP32 and SX1278: We will share the story of our project, how we finished it in 2 months, the problems we encountered with our cheap ...
Antwortete im Thread
@hikhvar @DO9XE @srslypascal @nicoduck @stahlmann @mimrma ich würd' je gern mal ne Alternative zu #POCSAG im #CB-Band umsetzen...
- Also mit anständiger #Verschlüsselung, weil TEA ist unsicher af.https://github.com/KBtechnologies/PocketCrypto
GitHubGitHub - KBtechnologies/PocketCrypto: An airgapped encryption/decryption device for off-grid communicationAn airgapped encryption/decryption device for off-grid communication - KBtechnologies/PocketCrypto
Antwortete im Thread
@CStamp @persagen whilst it's easy to attribute #Unit8200 for that, I'd say this is a too easy kind of explaination as it would be in the best interest if the #IDF to keep enemies like #Hezbollah in blissful ignorance about their #vulnerable #tech whilst maximizing #SIGINT effectiveness by not giving them a reason to implement secure #comms.
To me that sounds like a project some recruit of that unit would've to plan as a means to qualify for membership of that unit.
- It doesn't make sense to pull that #PagerHack off given it's quite newly deployed (older batteries would've more reliably and faster gone critical due to #Overdischarge!) and having pulled this #exploit also means Hezbollah will clearly fix those issues, starting with devices using #NiCd or #LiFePO4 batteries if not employing proper #E2EE instead of using insecure & #unencrypted #POCSAG...
But since I'm not getting paid for fixing that shitshow AND don't work with or for terrorists (!!!) I won't plug any projects that would've prevented this...
Wenn ich jetzt #pocsag tracke, explodiert dann mein #FlipperZero ?
Antwortete im Thread
@hal8999 @admin @briankrebs Also it's not hard to get brand new #POCSAG #Pagers as they are still in use in many places like #Germany.
- Only a few years ago did Fire Departmebts switch to the marginally more "secure" models with #TETRA.
(Marginally more secure as in even the lowest end iGPU can crack it in realtime!)
Fortgeführter Thread
Heute einen #POCSAG-#Funkruf-#Sender runtergeladen (https://github.com/cn0xroot/gr-pocsag-1) und auf den #HackRF #SDR geworfen.
Nachdem ich #gnuradio inkl. Zubehör komplett neu kompiliert und ein paar kleinere Anpassungen gemacht habe, läuft es nun und der #Pager empfängt meine Testmeldungen fehlerfrei.
Der Pager ist somit ok und die beobachteten Probleme scheinen auf zu geringe Stärke/Qualität des #DAPNET-Signals in Kombination mit der POCSAG-Fehlerkorrektur zurückzuführen zu sein.
GitHubGitHub - cn0xroot/gr-pocsag-1: gnuradio pocsag sender modulegnuradio pocsag sender module. Contribute to cn0xroot/gr-pocsag-1 development by creating an account on GitHub.
Heute ist mein #Alphapoc-#Pager für das #DAPNET-#Amateurfunk-#POCSAG-Netz eingetroffen (ein Pager ähnlich den #Skyper damals in den 90ern und wie ihn heutzutage noch die Feuerwehr verwendet).
Grundsätzlich geht es, aber die Nachrichten kommen nur verstümmelt an. Merkwürdigerweise sind die Fehler reproduzierbar immer an der selben Stelle und in der selben Form, was eher gegen Empfangsprobleme spricht. 
Mysteriös. Am Wochenende noch mal tiefer in die (sehr umfangreichen) Einstellungen schauen.