# TTEA: designing a quantum-ready and energy-conscious encryption model for secure IoT environments

## TL;DR

TTEA is a new encryption model for IoT devices that balances strong security with low energy use and resistance to quantum threats.

## Contribution

TTEA introduces a quantum-ready encryption framework with adaptive key scheduling and a novel S-box design for energy-efficient IoT security.

## Key findings

- TTEA reduces energy consumption by 39% compared to TEA on IoT platforms.
- It achieves 48.5% avalanche effect and 7.98 bits of ciphertext entropy.
- TTEA is resilient to quantum threats when combined with CRYSTALS-Kyber.

## Abstract

The proliferation of resource-constrained IoT devices has intensified the conflict between robust security requirements and hardware limitations. Conventional lightweight encryption algorithms (e.g., TEA, Speck) often fail to resolve this tension, exhibiting known cryptanalytic vulnerabilities while imposing excessive computational and energy overhead. This paper presents the Two-Stage Encryption Approach (TTEA), an innovative cryptographic framework optimized for IoT ecosystems. TTEA incorporates a \documentclass[12pt]{minimal}
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\begin{document}$$20 \times 20$$\end{document} bit-sliced S-box as a non-linear substitution layer to ensure high diffusion and resistance to differential attacks, together with an adaptive key scheduling mechanism that dynamically adjusts computational complexity based on device power states. Evaluation on standard IoT platforms such as ESP32 and Raspberry Pi demonstrates that TTEA reduces energy consumption by 39% compared to TEA, lowers memory requirements by 40%, and achieves 20% faster execution speeds. Security analysis confirms an avalanche effect of 48.5% and near-ideal ciphertext entropy (7.98 bits for 128B packets). Furthermore, TTEA shows resilience against differential and linear cryptanalysis, side-channel attacks, and quantum threats when integrated with CRYSTALS-Kyber for post-quantum key exchange. By bridging the gap between post-quantum security and energy efficiency, TTEA offers a validated solution for modern IoT deployments.