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Hackers Can Remotely Trigger the Brakes on American Trains and the Problem Has Been Ignored for Years

41 minutes 25 seconds ago
Many trains in the U.S. are vulnerable to a hack that can remotely lock a train's brakes, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA) and the researcher who discovered the vulnerability. From a report:The railroad industry has known about the vulnerability for more than a decade but only recently began to fix it. Independent researcher Neil Smith first discovered the vulnerability, which can be exploited over radio frequencies, in 2012. "All of the knowledge to generate the exploit already exists on the internet. AI could even build it for you," Smith told 404 Media. "The physical aspect really only means that you could not exploit this over the internet from another country, you would need to be some physical distance from the train [so] that your signal is still received."

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Perplexity CEO Says Tech Giants 'Copy Anything That's Good'

1 hour 21 minutes ago
Perplexity CEO Aravind Srinivas warned young entrepreneurs that tech giants will "copy anything that's good" during a talk at Y Combinator's AI Startup School, telling founders they must "live with that fear." Srinivas said that companies raising tens of billions need to justify capital expenditures and search for new revenue streams. Perplexity pioneered web-crawling chatbots when it launched its answer engine in December 2022, but Google's Bard added internet-crawling three months later, followed by ChatGPT in May 2023 and Anthropic's Claude in March 2025. The competition has extended to browsers, with Perplexity launching its Comet browser on July 9 and Reuters reporting that OpenAI is developing a web browser to challenge Google Chrome. Perplexity's communications head Jesse Dwyer said larger companies will "drown your voice."

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