JISE

[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]

Journal of Information Science and Engineering, Vol. 22 No. 2, pp. 391-399

Cryptanalysis of Improved Liaw's Broadcasting Cryptosystem

J. Munoz Masque and A. Peinado^**
Departamento de Tratamiento de la Informaciony Codificacion
Instituto de Fisica Aplicada del CSIC
C/Serrano, 144 – 28006 Madrid, Spain
E-mail: jaime@iec.scic.es
^**Departamento de Ingenieria de Comunicaciones
E.T.S.I. Telecomunicacion
Universidad de Malaga
Campus de Teatinos, E29071 Malaga, Spain
E-mail: apeinado@ic.uma.es

An inconsistency in the improvement given in [1] on Liaw’s broadcasting crytosystem [2] is detected and new attacks to the system are presented. A modification of the cryptosystem to overcome both the conspiracy attack and our own cryptanalysis is proposed.

Keywords: cryptanalysis, broadcasting encryption, key management, public-key cryptosystem, eavesdropping, factorization problem

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