VoIP Secure Communication Protocol satisfying Backward Compatibility. - Joongman Kim; Seokung Yoon; Yoojae Won; Jaeil Lee (ICSNC, 2007)

Implementation and Evaluation of SIP-Based Secure VoIP Communication System. - Joongman Kim; Seokung Yoon; Hyuncheol Jeong; Yoojae Won (EUC (2), 2008)

The SEED Cipher Algorithm and Its Use with the Secure Real-Time Transport Protocol (SRTP). - Seokung Yoon; Joongman Kim; Haeryong Park; Hyuncheol Jeong; Yoojae Won (RFC, 2010)