Senthil Kumar, K., and D. Malathi. “A Novel Method to Represent Access Tree Structure by Context Free Grammar With and-or Graph in Key Policy Based Attribute Based Encryption”. International Journal of Engineering & Technology 7, no. 4.10 (October 2, 2018): 396–398. Accessed April 29, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/20946.