Introduction and
Security Projects
Distributed Applications
Multicast Stream Authentication      

Multicast transmission means sending the same information from one sender to a set of N receivers. This kind of transmission may make an efficient use of network resources, replicating the transmitted information only when necessary, and avoiding the creation of N unicast connections.

On the other end, the use of multicast transmission poses new security problems; these problems are related to the confidentiality and to the authenticity of the transmitted information.

Our research deals with studying and developing protocols that allow for the individual authentication of the sender of the transmitted data taking into account the efficient use of the computational resources, both at the sender and at the receiver side. These protocols are particularly useful when there is a continuous data flow from the sender to the receivers.

Papers (selection)  

F. Bergadano, B. Crispo, D. Cavagnino. Individual Authentication in Multiparty Communications Computer & Security Journal, Elsevier Science, vol. 21 n. 8, November 2002, pp.719-735.

F. Bergadano, D. Cavagnino, B. Crispo. Chained Stream Authentication Proc. of Selected Areas in Cryptography 2000, D. R. Stinson, S. Tavares Eds., LNCS 2012, pages 144-157, 14-15 August, Waterloo, Ontario, Canada.

F. Bergadano, D. Cavagnino, B. Crispo. Individual Single Source Authentication on the MBONE IEEE Int. Conf. on Multimedia and Expo, pages 541-544, New York, July 2000.

F. Bergadano, D. Cavagnino, B. Crispo. Issues in Multicast Security Cambrigde Int. Workshop on Security Protocols, Cambridge, UK, 1999, Lecture Notes in Computer Science, LNCS 1796 pp 121-144 (Springer).

Software and Links  

Slides presented in Cambridge     [pdf]

More info? Contact person is Davide Cavagnino: davide[at]


Dept. of
Computer Science
University of
Web Technology
Web Technology