Title	A Survey of Public-key Cryptography over Non-abelian Groups
Author	G. H. J. Lanel, T. M. K. K. Jinasena and B. A. K. Welihinda
Citation	Vol. 21  No. 4  pp. 289-300
Keywords	Cryptography, Diffie-Hellman, Discrete Logarithm Problem, El-Gamal, Hamiltonian Cycle/Path Problem, Non-abelian/Non-commutative.

Title	Smart Deaf Emergency Application Based on Human-Computer Interaction Principles
Author	Thowiba E Ahmed, Naba Abdulraouf Almadan, Alma Nabil Elsad다, Haya Zayed Albishi, Norah Eid Al-Qahtani, Sarah Khaled Alghamdi
Citation	Vol. 21  No. 4  pp. 284-288
Keywords	Smart Deaf Emergency, Human-Computer Interaction, TTY, Impaired hearing.

Title	Underwater Acoustic Mavlink Communication for Swarming AUVS
Author	Yukiko Muller, Shiho Oshiro, Takuma Motohara, Atsushi Kinjo, Taisaku Suzuki, Tomohisa Wada
Citation	Vol. 21  No. 4  pp. 277-283
Keywords	UWA, Swarming AUVs, MAVLink, RaspberryPi, OFDM

Title	Hybrid Model Based Intruder Detection System to Prevent Users from Cyber Attacks
Author	Devendra Kumar Singh and Manish Shrivastava
Citation	Vol. 21  No. 4  pp. 272-276
Keywords	IDS; Cyber Attacks; PSO; GA; ELM; KDD