Detection of SIP De-Registration and Call-Disruption Attacks Using a Retransmission Mechanism and a Countermeasure Scheme. - Hyun-Soo Cha; Jea-Tek Ryu; Byeong-Hee Roh; JeongWook Kim; Hyun-Cheol Jeong (SITIS, 2008)

Detection of SIP Flooding Attacks based on the Upper Bound of the Possible Number of SIP Messages. - Jea-Tek Ryu; Byeong-Hee Roh; Ki-Yeol Ryu (KSII Trans. Internet Inf. Syst., 2009)

Detection And Countermeasure Scheme For Call-Disruption Attacks On SIP-Based Voip Services. - Jea-Tek Ryu; Byeong-Hee Roh; Ki-Yeol Ryu; Myungchul Yoon (KSII Trans. Internet Inf. Syst., 2012)

A whitelist-based countermeasure scheme using a Bloom filter against SIP flooding attacks. - Byeong-Hee Roh; Ju Wan Kim; Ki-Yeol Ryu; Jea-Tek Ryu (Comput. Secur., 2013)