## 5 Experiments and Analysis of Results
### Discussion and Practical Applications  
1. Ethical considerations  
In the transmission of data in critical infrastructure, such as ports, ensuring the security of communications is not only a technical issue, but also an important ethical responsibility. As the hub of international trade and logistics, data security breaches in ports may have a serious impact on global supply chains and public safety. The optimization scheme proposed in this paper not only helps to reduce potential security risks, but also reflects the ethical commitment of researchers in protecting the public interest and maintaining social stability.  
2. Global relevance  
The diversity and complexity of port systems manifest themselves as unique challenges in different regions. For example, European ports typically face stricter data protection regulations such as GDPR, while ports in the Asian region may be more focused on coping with high-load operational demands. The AES+Pre scheme proposed in this paper has both high efficiency and high security, which can meet the diverse needs of different regions.  
3. Necessity of research  
In recent years, port data security incidents have occurred frequently, such as the operation interruption of some port systems due to cyber attacks, and the disclosure of sensitive data in the logistics chain. These events have not only affected business operations, but also had a profound impact on global trade and the economy. With the rapid development of port automation and intelligence, the volume and sensitivity of data transmission have increased significantly, and it has become an urgent task to strengthen port data security. By combining the TLS protocol and the optimized AES encryption scheme, this paper provides an efficient and secure communication method that can effectively cope with these challenges faced by current ports.  
4. Economic and social impact  
The scheme proposed in this paper has significant economic and social benefits, which are embodied in the following aspects:  
Cost reduction: By reducing the transmission delay and optimizing the encryption algorithm, the bandwidth requirements and hardware resource consumption of the end-to-end communication are reduced, thus reducing the cost of upgrading and maintenance of the port's IT infrastructure.  
Improve efficiency: The precomputation mechanism of AES+Pre greatly improves the throughput and transmission speed, especially in the communication scenario with a large amount of data, which helps to shorten the logistics time and enhance the overall operation efficiency of the port.  
Enhanced security and public trust: By providing end-to-end encrypted communication protection, our scheme reduces the risk of data breaches and cyber attacks, thereby enhancing the security of the port.  
5. Practical applications and industry impact  
In this paper, by integrating the TLS protocol with an AES encryption algorithm and optimizing its key modules (such as the precomputation of S-box), the security and efficiency of data communication of port smart devices are significantly improved. This achievement has a broader practical impact on port operations in the following aspects:  
Cost savings: By improving the encryption algorithm and transmission efficiency, the end-to-end communication delay is reduced and the network bandwidth requirement is reduced. This optimization can reduce the frequency of port IT infrastructure upgrades, thereby saving equipment and operation and maintenance costs.  
Enhanced operational reliability: The optimized design of AES+Pre is suitable for high concurrency and multi-node communication scenarios, which can support the reliable operation of ports in high load environments, reduce the operation interruption caused by transmission delay or data loss, and improve the overall operation efficiency.