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Multimedia community is moving from monolithic applications to more flexible and scalable integrated solutions. Stream authentication is more complex since a stream may consist of multiple sources and be transcoded by intermediate proxies. In this paper, we propose a multi-source stream authentication (mSSA) framework based on MPEG-4 stream format. We describe the overall authentication architecture and elaborate the encoding, hashing, signing, amortizing and verifying methods used in the basic scheme. Further on, we utilize advanced cryptographic primitives-aggregate signature schemes, to reduce the signatures' size and improve the performance. We illustrate the scheme and discuss the extensions. Our analysis shows that the scheme is secure and efficient. [ABSTRACT FROM AUTHOR]

In this paper, a refined sequential aggregate signature scheme from RSA that works for any modulus is presented, then a compact stimulation mechanism without a central, trusted authority for routing discovery in civilian ad hoc networks is proposed as an immediate application of this cryptographic primitive. Our protocol forces selfish nodes to cooperate and report actions honestly, thus enables our routing discovery protocol to resist selfish actions within our model. Keywords: Network security, Routing discovery protocol, Sequential aggregate signature. [ABSTRACT FROM AUTHOR]