Information Security: 15th International Conference, ISC by Manas Pathak, Jose Portelo, Bhiksha Raj, Isabel Trancoso

By Manas Pathak, Jose Portelo, Bhiksha Raj, Isabel Trancoso (auth.), Dieter Gollmann, Felix C. Freiling (eds.)

This ebook constitutes the refereed lawsuits of the fifteenth overseas convention on info safeguard, ISC 2015, held in Passau, Germany, in September 2012.
The 23 revised complete papers awarded including one invited paper have been rigorously reviewed and chosen from seventy two submissions. The papers are geared up in topical sections on cryptography and cryptanalysis, mobility, playing cards and sensors, software program defense, processing encrypted information, authentication and id, new instructions in entry regulate, GPU for safeguard, and versions for probability and revocation.

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Additional info for Information Security: 15th International Conference, ISC 2012, Passau, Germany, September 19-21, 2012. Proceedings

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The results obtained for the SVM and k-NN classifiers are presented in Tables 5 and 4 respectively. Table 4. 2 Table 5. 1 we can infer that smaller Δ values result in smaller neighborhoods over which the distances between adjacent vectors can be deduced from their hashes. Thus, smaller Δ values result in hashes q(x) that better obscure the value of the vectors x. By the same token, however, they are also likely to result in poorer classification accuracy since x cannot reliably be compared to a model.

Remember that we aim for a high probability differential characteristics after the first round in both streams. This can be achieved by using short local collisions in the second round. Another possibility is to use local collisions spanning over two rounds and cancel the differences very early in the second round in each stream. Fig. 2. Three options to construct local collisions for two rounds Wj 28 F. Mendel et al. To get high-probability differential characteristics, we aim for local collisions over as few steps as possible.

However, even if we have differences in three message words, we need to construct up to four (short) local collisions. This places several constraints on the message words. Possible candidates for message words which contain differences are given in Sect. 3. If differences in a single message word are used, the local collisions have to be constructed over two rounds. The advantage is that we only need two local collisions instead of four. In general, this places less constraints on the message words and may also lead to sparser characteristics in the third round.

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