Kuppusamy, K., and K. Thamodaran. “OPTIMIZED HYBRID IMAGE SECURITY SCHEME FOR COPYRIGHT PROTECTION, AUTHENTICATION AND CONFIDENTIALITY USING PSO”. European Scientific Journal, ESJ 9, no. 6 (February 28, 2013). Accessed May 16, 2022. https://eujournal.org/index.php/esj/article/view/821.