Secure Transcoding with JPSEC Confidentiality and Authentication (MP-S2)

Author(s) : Susie Wee (HP Labs, USA) John Apostolopoulos (HP Labs, USA)

Abstract : Secure scalable streaming (SSS) enables low-complexity, high-quality transcoding at intermediate, possibly untrusted, network nodes without compromising the end-to-end security of the system~\cite{SSS:icassp2001,SSS:icip2001}. SSS encodes, encrypts, and packetizes video into secure scalable packets in a manner that allows downstream transcoders to perform transcoding operations such as bitrate reduction and spatial downsampling by simply truncating or discarding packets, and without decrypting the data. Secure scalable packets have unencrypted headers that provide hints such as optimal truncation points to downstream transcoders. Using these hints, downstream transcoders can perform near-optimal secure transcoding. We present a method for encrypting JPEG-2000 codestreams in a manner that preserves the scalability of the codestream data. It achieves this by inserting metadata into a security parameter set that is included in the header of the codestream. In essence, this header is a secure scalable hint track that guides a transcoder in extracting portions of the encrypted data in a scalable manner.

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