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Journal of Information Science and Engineering, Vol. 22 No. 2, pp. 391-399 (March 2006)

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 ¡V 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

Full Text (¥þ¤åÀÉ) Retrieve PDF document (200603_10.pdf)

Received June 16, 2003; revised October 7, 2004 & March 10, 2005; accepted September 26, 2005.
Communicated by Shiuh-Pyng Shieh.
*This work has been supported by MEC-Spain under grant SEG2004-02418, "Evaluacion de protocolos y algoritmos de seguridad en sistemas de informacion."