The Verge报道指出，谷歌今天宣布，任何运行Android 7或更高版本操作系统的手机，现在都可以充当双因素验证机制的物理安全密钥。这与谷歌当前提供的其他几种双因素验证方法相比，用户登录谷歌应用程序将变得更加安全。如果用户想要使用物理设备进行登录验证，不再需要购买一个加密锁，直接使用手机就可以了。
要让安卓手机成为物理安全密钥，用户只需要通过蓝牙将手机连接到PC，再用PC上的Chrome浏览器验证登录即可。新的身份验证方案适用于Gmail、G Suite、Google Cloud以及任何其他谷歌帐户服务，并使用FIDO身份验证标准。谷歌表示，其他网站可能会在稍后添加这种方案，但它仍处于验证其服务的过程中。
当有人获得用户密码时，双因素身份验证可以帮助防止未经授权的登录，这在数据泄密和网络钓鱼攻击导致帐户陷入危险中时非常重要。谷歌建议每个人都使用自己的手机作为物理安全密钥，并且特别建议“容易遭到网络攻击风险的记者、活动人士、商业领袖和政治竞选团队”使用手机。
并非所有的双因素身份验证方法都同样安全可靠，谷歌在其验证史上提供了一系列案例，比如短信验证码（有明显弱点）、谷歌认证器的旋转编码以及谷歌提示等，后者可让安卓手机和谷歌服务在计算机上直接通过互联网相互交流。而新的物理安全密钥的工作原理非常类似于谷歌提示，但它要求用户手机必须实际靠近计算机，以阻止那些可能试图从世界各地登录你的用户账户的人。
此外，新的验证机制还使用了两种身份验证协议，即FIDO和WebAuthn，借此来检查用户是否在访问正确的网站，并且没有受到钓鱼攻击。
要想将安卓手机激活作为安全密钥，用户需要一部运行Android 7或更高版本操作系统的手机，并在Chrome OS、macOS或Windows 10设备上打开单独的Chrome浏览器。首先，在安卓手机上登录谷歌账户，打开蓝牙。然后在第二部设备上打开Chrome浏览器的myaccount.google.com/security，点击“两步验证”。选择添加安全密钥的选项，并从设备列表中选择用户的手机。
如果用户使用的是Pixel 3，可以使用音量下降按钮来激活安全密钥，谷歌表示，它将FIDO凭证存储在Pixel的Titan M芯片中，该芯片可以验证按压按键是否合法。其他运行Android 7及更高版本的设备仍然可以使用两步身份验证方法，但用户需要登录并点击一个按钮。
目前，谷歌的物理安全密匙服务只能在安卓手机上使用，而且只适用于登录谷歌服务，而不是第三方网站。谷歌表示，由于新技术运行在相同的协议上，包括FIDO标准，其他公司实现类似技术只是时间问题。除Chrome外，其他浏览器也可能获得支持，其他服务最终也可能会扩展到使用安卓手机作为安全密钥。谷歌宣称，它正在朝着这个最终目标努力。
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