Istituto di Scienza e Tecnologie dell'Informazione     
Oligeri G., Chessa S., Di Pietro R., Giunta G. Robust and efficient authentication of video stream broadcasting. In: ACM Transactions on Information and System Security, vol. 14 (1) article n. 5. ACM, 2011.
We present a novel video stream authentication scheme which combines signature amortization by means of hash chains and an advanced watermarking technique. We propose a new hash chain construction, the Duplex Hash Chain, which allows us to achieve bit-by-bit authentication that is robust to low bit error rates. This construction is well suited for wireless broadcast communications characterized by low packet losses such as in satellite networks. Moreover, neither hardware upgrades nor specific end-user equipment are needed to enjoy the authentication services. The computation overhead experienced on the receiver only sums to two hashes per block of pictures and one digital signature verification for the whole received stream. This overhead introduces a provably negligible decrease in video quality. A thorough analysis of the proposed solution is provided in conjunction with extensive simulations.
URL: http://portal.acm.org/citation.cfm?id=1952987&CFID=37030364&CFTOKEN=22169439
DOI: 10.1145/1952982.1952987
Subject Watermarking
Source authentication
D.4.6 Security and Protection. Authentication

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