Applied Cryptography and Network Security: 4th International by Ahren Studer, Chenxi Wang (auth.), Jianying Zhou, Moti Yung,

By Ahren Studer, Chenxi Wang (auth.), Jianying Zhou, Moti Yung, Feng Bao (eds.)

The 4th overseas convention on utilized Cryptography and community Security(ACNS 2006)washeldin Singapore,during June6-9,2006.ACNS 2006 introduced jointly members from academia and curious about a number of study disciplines of cryptography and protection to foster trade of rules. This quantity (LNCS 3989) comprises papers offered within the educational song. ACNS used to be set a excessive common while it used to be initiated in 2003. there was a gradual development within the caliber of its application long ago four years: ACNS 2003 (Kunming, China), ACNS 2004 (Yellow Mountain, China), ACNS 2005 (New York, USA), ACNS 2006 (Singapore). the typical acc- tance fee is saved at round 16%. we want to obtain the continuing aid from the neighborhood of cryptographyand protection around the globe to additional increase its caliber and make ACNS one of many top meetings. this system Committee of ACNS 2006 obtained a complete of 218 submissions fromallovertheworld,ofwhich33wereselectedforpresentationattheacademic music. as well as this music, the convention additionally hosted an commercial tune of displays that have been rigorously chosen besides. All submissions have been reviewed via specialists within the suitable parts. we're indebted to our application Committee contributors and the exterior reviewers for the nice task they've got played. The court cases comprise revised types of the authorized papers. despite the fact that, revisions weren't checked and the authors undergo complete accountability for the content material in their papers.

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Example text

The key idea is: replicate the key shares and make the signing servers anonymous to the other hosts including the clients, in addition to using threshold signing. The threshold signing scheme and replication technique provide fault-tolerance. The threshold signing scheme and anonymous signing servers provide intrusion-tolerance because the attackers cannot know which signing servers to attack in order to deny signing service, steal, or corrupt the secret signing key. By systematically combining these three techniques, DSO can provide not only very high fault-tolerance but also very high intrusiontolerance.

If we use standard deviation to measure the variation degree of RTTs, it should be small. If we combine the elements in the gap sets to form clusters, the cluster with smallest standard deviation should have the highest probability to represent the true RTTs. If we could prove this point, the way to pull out the true RTTs from the gap sets would become to find the cluster with smallest standard deviation. Probabilistic Proof of an Algorithm to Compute TCP Packet RTT 21 Table 1 shows the comparison of standard deviation over different clusters in a real world example that can give us some practical sense on the above analysis.

M, representative SHi can calculate m the new updated share as Si = Si + j=1 Sj,i (mod q). 4 Reliability and Security Analysis In this section, we analyze the fault-tolerance and security of DSO. Table1 list the notations we will use in the following analysis. Table 1. 1 Fault-Tolerance Analysis Fault tolerance of the system is measured as the probability that the service will be available to the clients in spite of the failures of individual nodes. For a given service, Rsys (t) represents the probability that the service is available during time interval (0, t).

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