Shang-Ming Jen Tse-Lin Lai Chia-Yu Lu Jar-Ferr Yang Knapsack Cryptosystems and Unreliable Reliance on Density. 748-754 2012 AINA https://doi.org/10.1109/AINA.2012.43 https://doi.ieeecomputersociety.org/10.1109/AINA.2012.43 conf/aina/2012 db/conf/aina/aina2012.html#JenLLY12