## 1 Introduction  
With the development of 6G technology applications, the future Internet of Things (IoT) will face an increasing number of endpoint devices that need to simultaneously transmit data to each other. For example, applications integrating edge and fog computing with the Internet of Intelligence may require the use of Virtual Network Functions (VNFs) [1], in which there are many concerns about information security during the transmission process [2, 3]. At this point, a significant challenge for research and industry is whether IoT endpoint devices can provide sufficient transmission efficiency and adequate security measures to handle the simultaneous data transmission required by various IoT applications. Given the diverse nature of IoT applications and the need for simultaneous transmission among a large number of endpoints, this paper is based on the Double OTP (D-OTP) proposed in [4], and then furthermore provides a zero-trust network architecture, namely the One-Time Password Pad Process (OTP\({}^{3}\)). This aims to realize a secure mechanism for transmitting asynchronous streaming signals between IoT device endpoints. Compared to pure software design, utilizing hardware acceleration can significantly enhance system performance. This research was inspired by these reports. Ref. [5] mentioned that a smartwatch designed for children has been found to have cybersecurity vulnerabilities, enabling hackers to steal the children's location. Moreover, the Mirai zombie virus [6], known for large-scale attacks on IoT devices, primarily targeted home routers, network cameras, and smart TVs at the time. Subsequently, eleven new variants of the virus were discovered, notably one that targeted wireless projection servers used in offices. This event serves as a reminder that hackers can infiltrate corporate networks and steal business secrets through insecure commercial devices. Furthermore, in an analysis reported by the National Aeronautics and Space Administration (NASA) [7], their Jet Propulsion Laboratory (JPL) was breached by hackers using a Raspberry Pi device as a pivot point. The hackers successfully invaded the laboratory, stealing critical data, making it one of the most prominent cybersecurity events worldwide in recent years. It was known that Industrial Information System (IIS) or Industrial Control System (ICS) of the enterprise organization had been attacked and might be extorted by hackers for a high ransom [8; 9], and thus security will become the most mainstream development initiative. In the post-5G era, the concept of information security protection through methods including zero-trust are rapidly gaining prominence [10]. The zero-trust network requires IoT devices to ensure their own security. However, due to the limited computing capability and hardware resources of IoT devices, conventional IoT devices often fail to provide adequate self-security. This vulnerability becomes more pronounced when considering the future threat of quantum computing. The advancement in the Internet of Things will be accelerated by the 5G system [11] and the coming 6G technology, which includes considerations about whether enough security measures can be provided when utilizing NB-IoT (Narrow Band-Internet of Things) technology [12] to meet the application requirements of Massive Machine-Type Communications (mMTC) [13]. It is evident that the opportunities in the IoT landscape are rapidly growing. However, this growth also raises security concerns for devices and applications. At this point, a significant challenge for research, education, and industry is whether IoT endpoint devices can simultaneously provide adequate transmission efficiency and comprehensive security measures [14]. Facing this issue and challenge, this paper is based on the functionality and design required for the proposed OTP\({}^{3}\) operation process, which aims to realize a secure mechanism suitable for transmitting asynchronous streaming signals between IoT device endpoints. This mechanism adopts a fog computing architecture [1].