TLS
Link-layer protocols often provide some basic security mechanisms to guarantee the authentication of the client connecting to a specific network and encrypt data by using symmetric keys such as AES. In most cases, authentication at the link layer is sufficient to guarantee a basic level of security. Nevertheless, pre-shared, well-known keys often used in LR-WPAN network stacks may be vulnerable to multiple kinds of attacks, and using a pre-shared key would allow an attacker to decipher any traffic that has been previously captured on the same link if the key was compromised. In other scenarios, encryption alone is not sufficient to guarantee that the other endpoint is what it claims to be, or that the data flow has not been altered during transmission.
A device that takes part in an IoT-distributed system is required to implement a higher grade of security, especially in embedded devices that do not protect the memory in any way and where any backdoor means that attackers can...
