We tackle a fundamental security problem in underwater acoustic networks (UANs). The S-box in the existing block encryption\nalgorithm is more energy consuming and unsuitable for resources-constrained UANs. In this paper, instead of S-box, we present a\nlightweight, 8-round iteration block cipher algorithm forUANs communication based on chaotic theory and increase the key space\nby changing the number of iteration round.We further propose secure network architecture of UANs. By analysis, our algorithm can\nresist brute-force searches and adversarial attacks. Simulation results show that, compared with traditional AES-128 and PRESENT\nalgorithms, our cryptographic algorithm can make a good trade-off between security and overhead, has better energy efficiency,\nand applies to UANs
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