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The Cost of Adding Security Services to Group Communication Systems Cristina Nita-Rotaru

Summary: The Cost of Adding Security Services to Group Communication Systems

Cristina Nita-Rotaru
Advisor: Dr. Yair Amir
Submitted in partial fulfillment of the Ph.D. qualifiers
Department of Computer Science
Johns Hopkins University
Numerous applications requiring information delivery from one sender to many receivers are based on a group
communication model. Group communication systems are used in industry and military systems where relia-
bility and high-availability are required. With the growth of the Internet, the number of applications that can
take advantage of a group communication infrastructure increased (teleconferences, white-boards, video confer-
ences, distributed interactive simulation, collaborative work). Over wide area networks the need for providing
confidentiality, integrity, and authenticity of messages is essential.
In this paper we present Secure Spread, a secure version of the Spread Toolkit. Secure Spread is a group
communication system that utilizes contributory group key management developed by the Cliques project and
Blowfish symmetric encryption algorithm. Its modular design allows drop-in replacement of encryption and/or
key agreement protocol. This work will not go to the details of a complete solution that handles every possible
combination of network events. Rather it will focus on the performance evaluation in the general case. The results
will give a good indication and insight of the overall cost of security in a group communication environment.


Source: Amir, Yair - Department of Computer Science, Johns Hopkins University


Collections: Computer Technologies and Information Sciences