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	KSII Transactions on Internet and Information Systems, VOL 13 NO. 12 PP. 6159 ~ 6174 2019. 12
	Data-Hiding for Halftone Images Using an Improved CPT scheme
	Phan Trung Huy Nguyen Hai Thanh Cheonshik Kim Ching-Nung Yang
	KSII Transactions on Internet and Information Systems, VOL 07 NO. 02 PP. 0405 ~ 0424 2013. 02
	Data Hiding in Halftone Images by XOR Block-Wise Operation with Difference Minimization
	Ching-Nung Yang Guo-Cin Ye and Cheonshik Kim
	KSII Transactions on Internet and Information Systems, VOL 05 NO. 02 PP. 0457 ~ 0476 2011. 02