Omar MI, W. Kipruto DC, W. Kimwele DM. Securing the IP Multimedia Subsystem with IPsec and HTTP Digest. IJC [Internet]. 2017 Jul. 30 [cited 2024 May 2];26(1):117-28. Available from: https://ijcjournal.org/index.php/InternationalJournalOfComputer/article/view/1025