contributions of our paper are as follows:

1.  By introducing a near non-blocking configurable switching and toggling network (CSTN), we show how we add dynamicity to the IoT devices intercommunication.

2.  We show that this dynamicity along with the fast and efficient ACORN invalidates the possibility of the leakage of each message, which helps to show that this approach is provably resilient against physical attacks such as side-channel, scan-based SAT attack, and algebraic attack.

3.  The dynamicity of *ExTru* allows us to relax the responsibility of ACORN, which helps to considerably boost the performance of the communication channel between IoT devices while the possibility of leakage is almost *ZERO*. Also by conveying part of the responsibility to the near non-blocking CSTN, we show that the energy consumption would be mitigated considerably.

4.  To depict the efficiency of *ExTru* in terms of security, energy, and performance, we provide a full-detailed post-route evaluation on the proposed scheme compared to conventional IoT inter-communication mechanisms that almost use a conventional side-channel resistant block/stream.

The rest of the paper is organized as follows: Section \[sec:related\] presents the previous work. Section \[sec:proposed\] elaborates the overall structure of the proposed dynamically encrypted scheme and how it is 