H. El-Kamchouchi and Heba Gaber and Fatma Ahmed and Dalia H. El-Kamchouchi, Secure Proxy Signature Based on Factoring and Discrete Logarithm. journal = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. May 2016, vol. 115(7). 1337 - 1340 [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10004948.