WASET
    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.