Abstract
전술무선통신망의 급격한 증가로 이기종망간 단대단 음성보안통신은 매우 중요한 보안이슈가 되어왔다. 일반적으로 고비도의 단대단 음성보안통신은 사용자 통신단말에 고비도의 암호알고리즘을 적용함으로써 가능하나, 이는 이기종망간 암호화된 데이터를 직접 전송할 수 없는 문제점을 필수적으로 야기시킨다. 다시 말해, 서로 다른 전술통신망 사이에 위치하는 망연동 게이트웨이에서 암호화 데이터에 대한 복호화 및 재암호화와 같은 부가절차가 필연적으로 요구된다. 본 논문에서는 이기종 전술통신환경에서 게이트웨이에서의 복호화 및 재암호화에 따른 문제점을 해결하고, 최적의 단대단 음성보안체계를 수립하기 위해 UHF와 PSTN 통신망간 단대단 음성보안통신 메커니즘을 제안하고 기존 메커니즘 대비 제안 메커니즘의 성능을 비교, 분석한다. 제안된 메커니즘은 망연동 게이트웨이에서의 복호화 및 재암호화에 따른 부가지연이 전혀 없고, 이기종망간 우수한 연동특성을 가진다. With the widely applications of tactical radio networks, end-to-end secure speech communication in the heterogeneous network has become a very significant security issue. High-grade end-to-end speech security can be achieved using encryption algorithms at user ends. However, the use of encryption techniques results in a problem that encrypted speech data cannot be directly transmitted over heterogeneous tactical networks. That is, the decryption and re-encryption process must be fulfilled at the gateway between two different networks. In this paper, in order to solve this problem and to achieve optimal end-to-end speech security for heterogeneous tactical environments, we propose a novel mechanism for end-to-end secure speech transmission over ultra high frequency (UHF) and public switched telephone network (PSTN) and evaluate against the performance of conventional mechanism. Our proposed mechanism has advantages of no decryption and re-encryption at the gateway, no processing delay at the gateway, and good inter-operability over UHF and PSTN.
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