Biblio

This paper shows that the modern high customizable Xtensa architecture for embedded devices is exploitable by Return-Oriented Programming (ROP) attacks. We used a simple Hello-World application written with the RIOT OS as an almost minimal code basis for determining if the number of gadgets that can be found in this code base is sufficient to build a reasonably complex attack. We determined 859 found gadgets which are sufficient to create a gadget catalog for the Xtensa. Despite the code basis used being really small, the presented gadget catalog provides Turing completeness, which allows an arbitrary computation of any exploit program.

As the number of Internet of things devices increases, there is a growing importance of securely managing and storing the secret and private keys in these devices. Public-key cryptosystems or symmetric encryption algorithms both use special keys that need to be kept secret from other peers in the network. Additionally, ensuring the integrity of the installed application firmware of these devices is another security problem. In this study, private key storage methods are explained in general. Also, ESP32-S2 device is used for experimental case study for its robust built-in trusted platform module. Secure boot and flash encryption functionalities of ESP32-S2 device, which offers a solution to these security problems, are explained and tested in detail.

The Internet of Things (IoT) is a technology that allows connection between devices using the internet to collect and exchange data with each other. Privacy and security have become the most pressing issues in the IoT network, especially in the smart home. Nevertheless, there are still many smart home devices that have not implemented security and privacy policies. This study proposes a remote sensor control system built on ESP32 to implement a smart home through the Message Queuing Telemetry Transport(MQTT) protocol by applying the Advanced Encryption Standard (AES) algorithm with a 256-bit key. It addresses security issues in the smart home by encrypting messages sent from users to sensors. Besides ESP32, the system implementation also uses Raspberry Pi and smartphone with Android applications. The network was analyzed using Wireshark, and it showed that the message sent was encrypted. This implementation could prevent brute force attacks, with the result that it could guarantee the confidentiality of a message. Meanwhile, from several experiments conducted in this study, the difference in the average time of sending encrypted and unencrypted messages was not too significant, i.e., 20 ms.

This paper describe most popular IoT protocols used for IoT embedded systems and research their advantage and disadvantage. Hardware stage used in this experiment is described in this article - it is used Esp32 and programming language C. It is very important to use corrected IoT protocol that is determines of purpose, hardware and software of system. There are so different IoT protocols, because they are cover vary requirements for vary cases.