for a high portion of IoT edge devices. Also, the performance of these ciphers considerably lower than regular block ciphers. This creates an inevitable security/cost trade-off in lightweight IoT devices, which results in sacrificing one of them, i.e. the security or the cost, which motivates the research community to carry on working/investigating on a low-energy and security-enhanced communication scheme in IoT while the performance is not degraded.

In this paper, we introduce a new lightweight, fast, and provably secure *Exp*irable *Tr*ust (*ExTru*) mechanism relied on a configurable switching and toggling network (CSTN) as well as the winner of the Competition for Authenticated Encryption: Security, Applicability, and Robustness (CAESAR) [@caesar2013competition], called ACORN [@wu2016acorn]. *ExTru* provably protects the inter-communication of IoT edge devices while it even obtains higher performance and mitigates the energy consumption compared to the case in which the regular block/stream ciphers have been used. Moreover, we show how *ExTru* engages dynamicity in the circuit to provide guaranteed protection against different types of physical and scan-based attacks, such as side-channel, Boolean satisfiability (SAT) attack, and algebraic attack. We demonstrate that by using this dynamic encryption scheme, the strength of security could be elevated from *per device* to *per message*. The 