Wearables are often small and have limited user interfaces, hence they often wirelessly interface with a personal smartphone or a personal computer to relay information from the wearable for display. In this paper, we envision a new method LightTouch by which a wearable can establish a secure connection to an ambient display, such as a television or computer monitor, based on the user's intention to connect to the display. Such connections must be secure to prevent impersonation attacks, must work with unmodified display hardware, and must be easy to establish. LightTouch uses standard RF methods for communicating the data to display, securely bootstrapped with a key shared via a brightness channel between the low cost, low power, ambient light sensor of a wearable and the screen of the display. A screen touch gesture is adopted by users to ensure the modulation of screen brightness can be accurately and securely captured by the ambient light sensor. We further propose novel on-screen localization and correlation algorithms to improve security and reliability. Through experiments we demonstrate that LightTouch is compatible with current display and wearable designs, easy-to-use (5-6 seconds), reliable for connecting displays (98 percent success connection ratio), and secure against impersonation attacks.

中文翻译：

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根据用户意图将可穿戴设备安全地连接到环境显示器

可穿戴设备通常很小且用户界面有限，因此它们通常与个人智能手机或个人计算机无线连接，以中继来自可穿戴设备的信息以供显示。在本文中，我们设想了一种新方法 LightTouch，通过该方法，可穿戴设备可以根据用户连接到显示器的意图与环境显示器（例如电视或计算机显示器）建立安全连接。此类连接必须安全以防止冒充攻击，必须与未经修改的显示硬件一起使用，并且必须易于建立。LightTouch 使用标准 RF 方法将数据传送到显示器，并通过可穿戴设备的低成本、低功耗环境光传感器和显示器屏幕之间的亮度通道共享密钥安全引导。用户采用屏幕触摸手势，确保环境光传感器能够准确、安全地捕捉屏幕亮度的调制。我们进一步提出了新颖的屏幕定位和相关算法，以提高安全性和可靠性。通过实验，我们证明 LightTouch 与当前的显示器和可穿戴设计兼容，易于使用（5-6 秒），连接显示器可靠（98% 的成功连接率），并且可以防止假冒攻击。