Internet of Things (IoT) devices strive to maximize their utilities and preserve security of IoT system within limited capacity. In effect, these kinds of devices can be resumed to be rational devices toward the view of game theory. Previous utilities inherit the definitions deriving from quintessential games (e.g. prisoner's dilemma game). However, they are criticized for either arbitrary or elaboration. In this paper, we circumvent the criticism by devising a new utility function based on beliefs and entropy, which are extracted from IoT devices (e.g. signals). The new utility function dwarfs others in terms of practicability. In addition, we present a general rational information exchange protocol and define the utilities based on entropy formally especially in the key round. Furthermore, we compare the utilities with existing ones with similar conclusions. That is, our formal utility definitions are equivalent to previous ones. To the best of our knowledge, it's the first time to relate utilities with entropy and meanwhile achieve desirable security properties.

物联网（IoT）设备致力于在有限的容量内最大限度地发挥其效用并保持IoT系统的安全性。实际上，就博弈论而言，可以将这些类型的设备恢复为理性设备。先前的实用程序继承了源自经典游戏（例如，囚徒困境游戏）的定义。但是，他们因随意性或精心设计而受到批评。在本文中，我们通过基于信念和熵设计新的效用函数来规避批评，这些效用函数是从物联网设备（例如信号）中提取的。在实用性方面，新的实用程序功能使其他功能相形见war。此外，我们提出了一种通用的有理信息交换协议，并在形式上（尤其是在关键回合中）正式基于熵定义了实用程序。此外，我们将这些实用程序与现有的实用程序进行了比较，得出相似的结论。也就是说，我们的正式实用程序定义与以前的相同。据我们所知，这是第一次将实用程序与熵相关联，同时达到理想的安全性。