Multicasting is an efficient communication mechanism for group oriented applications such as video conferencing, distance learning etc. Assuring certain level of security over multicast communication has become vital in Internet applications. Various cryptographic algorithms have been used to provide different security services. One among the cryptographic scheme is the digital signature which ensures authentication, message integrity and sender non repudiation. Digital signature algorithm such as RSA/DSA with SHA-1 can be used. In order to prevent passive attack, confidentiality has to be ensured. Confidentiality can be achieved by using the symmetric key encryption approach. The main objective of this paper is to provide all the above security services with low communication overhead. RSA with SHA-1 is one of the efficient public key cryptographic algorithms to provide security and therefore, its efficient hardware implementation is of great importance. This paper also proposes the design of SHA-1 implementation in FPGA.

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Authentication Client Confidentiality Encryption Server Verification