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Whisper Leak: Side-Channel Attack on LLMs Revealed

First seen 11 Nov 2025, 16:33 UTC • Blogs.Microsoft

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Microsoft has identified a side-channel attack, termed 'Whisper Leak', that enables attackers to infer conversation topics of language models, even when communications are encrypted. This vulnerability affects users relying on end-to-end encryption for secure interactions with chatbots.

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Whisper Leak: Side-Channel Attack on LLMs Revealed

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