Создаем собственную базовую станцию при помощи SDR
В этой статье я хочу рассказать о том, как я запускал собственную базовую станцию мобильной связи (4G и 2G) при помощи относительно дешевого SDR-трансивера.
https://habr.com/ru/articles/1017672/?utm_source=habrahabr&utm_medium=rss&utm_campaign=1017672
Создаем собственную базовую станцию при помощи SDR
В этой статье я хочу рассказать о том, как я запускал собственную базовую станцию мобильной связи (4G и 2G) при помощи относительно дешевого SDR-трансивера.
Передача данных по лазерному лучу (BPSK)
В этом тексте я попробовал осуществить передачу данных по лазерному лучу буквально на основе подручных материалов. В тексте представлены основные идеи и решения для передачи и приёма битового потока c помощью BPSK модуляции.
https://habr.com/ru/articles/1023062/
#лазер #bpsk #laser #laser_led #лазерная_связь #i #q #sdr #costas_loop #гетеродин
Show HN: 1xBTS – Run your own CDMA network on an SDR
1xBTS는 오픈 소스 CDMA2000 1x 셀룰러 네트워크 스택으로, SDR(소프트웨어 정의 라디오)을 이용해 실제 CDMA 네트워크를 구축할 수 있다. Rust로 작성된 이 프로젝트는 무선 인터페이스부터 코어 네트워크까지 완전한 셀룰러 스택을 제공하며, 음성 통화, SMS, 데이터 패킷 처리 등 다양한 기능을 포함한다. 개발자들은 이를 통해 개인용 또는 연구용 CDMA 네트워크를 직접 운영하고 실험할 수 있다.
Some articles just leave me genuinely confused. Like this one:
A student managed to send an emergency radio signal to the Taiwanese railway system, and as a result, the emergency brakes of the trains started to engage. They mention that there are seven (?) verification parameters, but what does that even mean? Did he simply do a replay attack, since the traffic was unencrypted? If there were secrets in place, why were they not rotated?
For now I have to assume that the radio communication was just not adequately secured, which happens more often than you might think. But if you have any information on the technical details of this incident, please let me know :)
#cybersecurity #security #infosec #vulnerability #hacking #sdr
The Taipei Times has reported that a 23-year-old university student in Taiwan has been arrested after using a software-defined radio and hand held radio to hack into Taiwan High Speed Rail Corporation's (THSRC) internal radio communications and halt four trains mid-service. Chinese-language coverage from UDN and Newtalk fills in some details omitted in the English Taipei Times article. The system the student compromised is TETRA, and at 23:23 on April 5, 2026, the student transmitted a 'General Alarm' (GA) signal, the highest-priority TETRA alert, which automatically instructs trains in the area to switch to manual emergency braking. Four trains were stopped for
｢ According to local media reports, the student halted four trains for 48 minutes on April 5 by using software-defined radio (SDR) communications and handheld radios to transmit a high-priority “General Alarm” signal, triggering emergency braking procedures ｣
It's been a while since I held a soldering iron, so it looks and feels super rusty, but there's nothing I couldn't hide with hot glue, I guess ;)
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