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Signal, an end-to-end encrypted messaging app long considered one of the most secure in the world, has recently faced attacks from hackers accused of links to Russia.

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German prosecutors Friday launched a spying investigation into phishing attacks targeting lawmakers on the Signal messaging app, with an MP saying the latest Russia-directed plot against Germany was a "wake-up call".

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Artificial intelligence company OpenAI said Tuesday that it would release its latest cybersecurity model to a limited number of partners, after rival Anthropic also restricted release of a new system that uncovered thousands of vulnerabilities.