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By Alwyn Goh, David C. L. Ngo (auth.), Antonio Lioy, Daniele Mazzocchi (eds.)

This booklet constitutes the refereed lawsuits of the seventh IFIP foreign convention on Communications and Multimedia protection, CMS 2003, held in Torino, Italy in October 2003.

The 21 revised complete papers provided have been rigorously reviewed and chosen for presentation. The papers are equipped in topical sections on cryptography, community safety, cellular and instant community safeguard, belief and privateness, software safeguard, and multimedia defense.

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Extra resources for Communications and Multimedia Security. Advanced Techniques for Network and Data Protection: 7th IFIP-TC6 TC11 International Conference, CMS 2003, Torino, Italy, October 2-3, 2003. Proceedings

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1 Individual and Workgroup Parameterisations The most straightforward extension methodology would be via SNR k and ZNR E public-keys as the starting point. The protocol parameters are outlined below: Table 4. Sender-specific and workgroup-combined parameters SNR ZNR i∈ S k i = ki g S⊂U k = ∑ ki i ∈S ν, r ki Ei = k i B E = ∑ Ei i ∈S 〈µ, ν〉, 〈c, r〉 si = k i − εia ir (mod q) s = ∑ si (mod q) i ∈S i S with Schnorr-Zheng/NR differentiation via specification for r. The end result would be SNR signature 〈r, s〉 or ZNR signcryption 〈c, r, s〉, as would be computed by an entity with private-key a = ∑ εia i (mod q) .

13. 14. A Shamir (1979). How to Share a Secret. Assoc Comp Machinery (ACM) Comms vol 22, no 11: pp 612–613 P Feldman (1987). A Practical Scheme for Non-Interactive Verifiable Secret-Sharing. 28th IEEE Symp on the Foundations of Comp Sc: pp 427–437 TP Pedersen (1991). Distributed Provers with Applications to Undeniable Signatures. Eurocrypt-91, Springer-Verlag Lecture Notes in Computer Science (LNCS) 547: pp 221– 238 TP Pedersen (1991). A Threshold Cryptosystem without a Trusted Party. Eurocrypt-91, Springer-Verlag LNCS 547: pp 522–526 AJ Menezes (1993).

This paper reviews BGP vulnerabilities and their implications, derives security requirements based on the semantics of the protocol, and describes the S-BGP architecture. Refinements to the original S-BGP design, based on interactions with ISP operations personnel and further experience with a prototype implementation are presented, including a heuristic for significantly improving performance. The paper concludes with a comparison of S-BGP to other proposed approaches. 1 Problem Description à Routing in the public Internet is based on a distributed system composed of many routers, grouped into management domains called Autonomous Systems (ASes).

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