naa a22 4500 510794793 CHVBK 20180411083332.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11277-012-0640-4 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0640-4 Cryptanalysis and Improvement of Robust Deniable Authentication Protocol [Elektronische Daten] [Fagen Li, Tsuyoshi Takagi] A deniable authentication protocol enables a receiver to identify the source of a given message, but the receiver cannot prove the source of the message to a third party. Recently, Yoon etal. (Wirel Pers Commun 55:81-90, 2010) proposed a robust deniable authentication protocol based on ElGamal cryptosystem. Although they proved that their protocol satisfies the deniable authentication, mutual authentication and confidentiality, we show that their protocol does not satisfy the deniable authentication property. The receiver can prove the source of a given message to a third party. In addition, we propose an improved protocol that removes this weakness. Springer Science+Business Media, LLC., 2012 Cryptography nationallicence Deniable authentication nationallicence ElGamal cryptosystem nationallicence Attack nationallicence Li Fagen School of Computer Science and Engineering, University of Electronic Science and Technology of China, 611731, Chengdu, China aut Takagi Tsuyoshi Faculty of Mathematics, Kyushu University, 819-0395, Fukuoka, Japan aut Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1391-1398 0929-6212 69:4<1391 2013 69 11277 https://doi.org/10.1007/s11277-012-0640-4 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0640-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Fagen School of Computer Science and Engineering, University of Electronic Science and Technology of China, 611731, Chengdu, China aut NATIONALLICENCE 700 1- Takagi Tsuyoshi Faculty of Mathematics, Kyushu University, 819-0395, Fukuoka, Japan aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1391-1398 0929-6212 69:4<1391 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer