Abstract
In this letter, we propose an improvement on a knapsack probabilistic encryption scheme [B. Wang, Q. Wu, Y. Hu, Information Sciences 177 (2007)], which was shown vulnerable to attacks due to Youssef [A.M. Youssef, Information Sciences 179 (2009)] and Lee [M.S. Lee, Information Sciences 222 (2013)], respectively. The modified encryption scheme is secure against Youssef's and Lee's attacks only at the costs of slightly compromising the efficiency of the original proposal.
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