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Side-channel via delivery receipt timing on Signal and WhatsApp (Careless Whisper research)

Summary by unsafe.sh
研究揭示Signal和WhatsApp使用Signal协议实现端到端加密时存在的侧信道漏洞：尽管加密本身安全，但未加密的交付回执通过RTT特性泄露用户行为模式（如通信时间、地点）。攻击者可利用此信息推断用户活动。Signal通过架构设计缓解部分风险但无法完全消除；WhatsApp则面临更大威胁。当前主要缓解措施为速率限制，尚无实质性协议修复。此研究强调元数据信号在安全评估中的重要性。
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Side-channel via delivery receipt timing on Signal and WhatsApp (Careless Whisper research)

研究揭示Signal和WhatsApp使用Signal协议实现端到端加密时存在的侧信道漏洞：尽管加密本身安全，但未加密的交付回执通过RTT特性泄露用户行为模式（如通信时间、地点）。攻击者可利用此信息推断用户活动。Signal通过架构设计缓解部分风险但无法完全消除；WhatsApp则面临更大威胁。当前主要缓解措施为速率限制，尚无实质性协议修复。此研究强调元数据信号在安全评估中的重要性。

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unsafe.sh broke the news in on Friday, January 9, 2026.
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