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What Happens When You Click ‘Send’ on an Encrypted Message
当你点击‘发送’一条加密消息时，发生了什么
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Before leaving your device, your message is scrambled using public-key encryption—where the recipient’s public key locks it, and only their private key unlocks it.发送前，您的消息会使用公钥加密技术进行混淆：收件人的公钥用于加锁，仅其私钥可解密。
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Each app generates unique key pairs during setup, and those keys never travel across the internet; only encrypted data does.每款应用在初始设置时生成唯一的密钥对，这些密钥从不通过互联网传输，仅加密数据在网络上传输。
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Metadata like timestamps and contact IDs remain visible to service providers, but message content stays unreadable—even to the company running the app.时间戳、联系人ID等元数据对服务提供商可见，但消息内容始终不可读——即便运营该应用的公司也无法查看。
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End-to-end encryption means no server ever holds the decryption key, eliminating centralized points of failure or surveillance.端到端加密意味着服务器从不持有解密密钥，消除了中心化故障点或监控风险。
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If someone intercepts the data mid-transmission, they see only random characters unless they crack mathematically secure RSA or elliptic-curve algorithms.若有人在传输途中截获数据，看到的只是随机字符，除非他们攻破数学上安全的RSA或椭圆曲线算法。
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Forward secrecy adds another layer: each session uses temporary keys, so compromising one key won’t expose past or future conversations.前向保密提供额外保护：每次会话使用临时密钥，即使一个密钥被破解，也不会泄露过往或未来的对话。
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Your phone verifies identity through safety numbers or QR codes, preventing impersonation attacks known as man-in-the-middle breaches.您的手机通过安全号码或二维码验证对方身份，防止中间人攻击等冒充行为。
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Because encryption runs locally, speed remains high—even on older devices—as long as network latency and bandwidth support smooth delivery.由于加密在本地运行，速度依然很快——即使在旧设备上，只要网络延迟和带宽支持流畅传输即可。