WhatsApp 是如何运作的？
YouTube 上有一段 WhatsApp 软件开发人员 Rick Reed 制作的有关 WhatsApp 软件基础设施的技术视频。从基本逻辑上讲，WhatsApp 是一款聊天软件，您可以通过书面、音频和视频形式的加密连接以人对人、人对多人或群聊的形式进行交流。当 WhatsApp 首次安装在设备上时，它会匹配该人的电话号码和 WhatsApp 帐户，以便每个号码都在系统中注册为用户。由于电话号码在全球范围内都是唯一的，因此在注册阶段不需要额外的密码保护。
帐户验证过程是通过发送到该手机的短信来执行的。当您的设备首次与 WhatsApp 服务器通信时，系统会使用您收到的短信验证码创建您的电话号码独有的令牌（安全令牌）。该程序在其基础设施中使用定制的 XMPP 协议。 ICQ、AIM、Yahoo Chat 和 Google Talk 等程序过去也使用过该协议。为了自动将联系人添加到用户的 WhatsApp 联系人列表中，WhatsApp 会自动从设备的地址簿中检索所有电话号码，并将其与中央 WhatsApp 用户数据库进行比较。这样，就可以联系已保存电话号码的 WhatsApp 联系人。
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