A SYSTEM FOR END-TO-END AUTHENTICATION OF ADAPTIVE MULTIMEDIA CONTENT
Takashi Suzuki, Zulfikar Ramzan, Hiroshi Fujimoto, Craig Gentry, Takehiro Nakayama, Ravi Kumar Jain · Kluwer Academic Publishers eBooks · 2005
We present a multimedia content delivery system that preserves the end-to-end authenticity of original content while allowing content adaptation by intermediaries. Our system utilizes a novel multi-hop signature scheme using Merkle trees that permits selective element removal and insertion. To permit secure element insertion we introduce the notion of a placeholder. We propose a computationally efficient scheme to instantiate placeholders based on the hash-sign-switch paradigm using trapdoor hash functions. We developed a system prototype in which the proposed signature scheme is implemented as an extension of the W3C XML signature standard and is applied to content meta-data written in XML. Evaluation results show that the proposed scheme improves scalability and response time of protected adaptive content delivery systems by reducing computational overhead for intermediaries to commit to the inserted clement by 95% compared to schemes that use conventional digital signatures.