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Efficient In-Network Adaptation of Encrypted H.264/SVC Content (2009)
| Citations: | 10 - 5 self |
BibTeX
@MISC{Hellwagner09efficientin-network,
author = {Hermann Hellwagner and Robert Kuschnig and Thomas Stütz and Andreas Uhl},
title = {Efficient In-Network Adaptation of Encrypted H.264/SVC Content },
year = {2009}
}
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Abstract
This paper addresses the efficient adaptation of encrypted scalable video content (H.264/SVC). RTP-based in-network adaptation schemes on a media aware network element (MANE) in an IPTV and VoD scenario are considered. Two basic alternatives to implement encryption and adaptation of H.264/SVC content are investigated: (i) full, format-independent encryption making use of Secure RTP (SRTP); (ii) SVC-specific encryption that leaves the metadata relevant for adaptation (NAL unit headers) unencrypted. The SRTP-based scheme (i) is straightforward to deploy, but requires the MANE to be in the security context of the delivery, i.e., to be a trusted node. For adaptation, the content needs to be decrypted, scaled, and re-encrypted. The SVC-specific approach (ii) enables both full and selective encryption, e.g., of the base layer only. SVC-specific encryption is based on own previous work, which is substantially extended and detailed in this paper. The adaptation MANE can now be an untrusted node; adaptation becomes a low-complexity process, avoiding full decryption and re-encryption of the content. This paper presents the first experimental comparison of these two approaches and evaluates whether multimedia-specific encryption can lead to performance and application benefits. Potential security threats and security properties of the two approaches in the IPTV and VoD scenario are elementarily analyzed. In terms of runtime performance on the MANE our SVC-specific encryption scheme significantly outperforms the SRTP-based approach. SVC-specific encryption is also superior in terms of induced end-to-end delays. The performance can even be improved by selective application of the SVC-specific encryption scheme. The results indicate that efficient adaptation of SVC-encrypted content on low-end, untrusted network devices is feasible.
Keyphrases
svc content efficient in-network adaptation svc-specific encryption efficient adaptation vod scenario svc-specific encryption scheme induced end-to-end delay scalable video content base layer medium aware network element metadata relevant svc-specific approach potential security threat untrusted network device srtp-based approach selective application svc-encrypted content selective encryption full decryption low-complexity process previous work format-independent encryption secure rtp rtp-based in-network adaptation scheme security property security context adaptation mane srtp-based scheme runtime performance multimedia-specific encryption first experimental comparison application benefit basic alternative trusted node untrusted node nal unit header
