In this paper, we briefly describe an underwater media access control protocol based on the request to send/clear to send mechanism with security algorithms, which is proposed to provide data confidentiality, authenticity, and replay attack protection. The protocol includes the counter with cipher block chaining-message authentication code (CBC-MAC) for underwater (CCM-UW) mode that is the modified form of the counter with CBC-MAC (CCM*) mode for underwater acoustic communication, based on the advanced encryption standard/agency, research and institute, academy block cipher algorithm. CCM-UW security mechanism is suitable for underwater acoustic sensor networks (UWASNs) and offers six different security levels with different security strength, energy & Soo-Hyun Park consumption and transmission time. The results in the paper show that the protocol is not impracticable for UWASNs since it is energy efficient and saves transmission time.Keywords CCM-UW (counter with CBC-MAC for underwater) Á CCM* (counter with CBC-MAC) Á Media access control (MAC) Á RTS (request to send) Á CTS (clear to send) Á UWASNs (underwater acoustic sensor networks) Á AES (advanced encryption standard) Á ARIA (agency, research and institute, academy)

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