By Liang Xie, Hui Song, Suncun Zhu (auth.), Steven M. Bellovin, Rosario Gennaro, Angelos Keromytis, Moti Yung (eds.)

This booklet constitutes the refereed court cases of the sixth foreign convention on utilized Cryptography and community protection, ACNS 2008, held in manhattan, new york, united states, in June 2008.

The 30 revised complete papers offered have been rigorously reviewed and chosen from 131 submissions. The papers tackle all elements of utilized cryptography and community safeguard with detailed specialize in novel paradigms, unique instructions, and non-traditional perspectives.

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Example text

Our resolvers mapped to 189 countries. From each country we randomly choose up to k (=3) resolvers to form our final target list D of 495 resolvers 3 . We choose this particular methodology to serve our goal of ranking website according to their popularity from a global perspective. However, the selection criteria can be tuned to serve other ranking goals. For example, one could select all resolvers from a certain country to study web-site popularity with respect to users from that region. Investigating the selection of resolvers to serve such goals is outside the scope of this paper.

We now turn to illustrate the flexibility of our approach through two important security applications: web-metering and botnet size measurement. We believe these two applications serve as good examples of the strength of our scheme. A. Rajab et al. Table 2. 78 query/hour Cache probing rate 1 query every 5 mins. 1 Estimating Website Popularity As mentioned earlier, web metering (or popularity ranking) plays an important economic role in today’s Internet. Popularity rank, for instance, is a key factor in deciding the marketing potential of a website.

The resolvers list is first sanitized to extract the “cooperative resolvers” (resolvers that respond correctly to external cache queries). The sanitization phase involves sending two consecutive DNS queries to each resolver for a known DNS record. The first is a recursive query that forces the DNS server to fully resolve the query. The second query is sent with the recursion flag turned off to elicit a local reply from the resolver’s cache. We compare the replies for consistency and also verify that the value of the T T L field in the second response is smaller than the one in the first response.

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