# Client-Aware Negotiation for Secure and Efficient Data Transmission
## 1 Introduction
### Related Work  
The CAN-SEAT strategy is based on an authentication mechanism. In different application scenarios, the authentication mechanism is not exactly the same. For most systems that require authentication, there are some authentication mechanisms based on Public Key Cryptography (PKC), which is called a full handshake in SSL/TLS. At the same time, in SSL/TLS, there will be some authentication mechanisms for quick recovery. The usual purpose of these mechanisms is to reduce the overhead and response time for authentication on the basis of ensuring security. The traditional approach is session resume [11], and information from both communicating parties is stored locally for a period of time to speed up authentication. In addition, some new technologies are used in the new version to reduce overhead, such as 0-RTTand pre-shared key [12].  
Security and privacy issues are also some of the major challenges in the Internet of Things (IoT). Authentication, as an important part of ensuring security, uses the certificate to confirm the identity in the IoT. The traditional authentication methods are enhanced with authentication based on the user's location. [PERSON] et al. [13] suggested base authentication on attributes, rather than identities, to enhance privacy. [PERSON] et al. [14] considered that the biometric information of the owner should be used for authentication. [PERSON] et al. [15] proposed a mechanism of HTTP(S)-based authentication for IoT devices using a hash-chain generated between the server and the client. However, no matter how the identity is verified, the authentication process is based on PKC.  
There are many energy-efficient strategies for secure data transmission. [PERSON] et al. [16] investigated the problem where the current implementations of intelligent transportation systems are restricted by the conflicts between security and communication efficiency. Therefore, they proposed a security-aware efficient data sharing and transferring model to obtain secure real-time multimedia data sharing and transfer. [PERSON] et al. [17] designed a special secure transmission scheme called Energy-Efficient Transmission (EET) for the Internet of Things by considering the direct link that can be adopted in practical applications as an additional strategy. [PERSON] et al. [18] studied a Secrecy Energy Efficient (SEE) optimization problem in a multiple-input, multiple-output non-orthogonal multiple access network system. They proposed several iterative algorithms to solve the original SEE maximization problem based on [PERSON]'s algorithm and the difference of concave approximation method. To solve the same problem, [PERSON] et al. [19] proposed a fractional programming approach embedded with the difference of convex functions programming to manage the non-convexity of the formulated problem. The core idea is that the primal problem can be translated into a series of convex subproblems and then be solved by convex programming.  
Although all of the above work suggests some energy-efficient strategies for secure data transmission, their methods are more dedicated and difficult to apply to the server or HTTPS. Therefore, research on HTTPS is still necessary. In related work, the authors did not find a system that uses the method described in this manuscript. More related research is based on algorithms and protocols. However, distinguishing users is indeed an effective and feasible solution for reducing transmission overhead.