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• [P692] A New Efficient Strong Proxy Signcryption Scheme Based on a Combination of Hard Problems
  Author(s): Roayat Ismail Elseedy
  
  

  Abstract
  Proxy signcryption scheme is the combination of proxy signature and encryption. In this paper we propose a new proxy signcryption scheme which has the following advantages as compared to the previous schemes: (1) It is based on a combination of hard problems: Integer Factorization Problem (IFP), Discrete Logarithm Problem (DLP), Diffie-Hellman Problem (DHP), and irreversibility of a One-Way Hash Function (OWHF). This combination achieves a strong security level. (2) It provides non-repudiation and public verifiability for both the original signcrypter and the proxy signcrypter. (3) It provides forward secrecy. (4) It provides proxy-protection against the original signcrypter. (5) It doesn't require a secure channel between the original signcrypter and the proxy signcrypter. (6) With all these advantages the proposed scheme is efficient.

  
   

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