We describe an approach for recovering the plaintext in block ciphers having a design structure similar to the Data Encryption Standard but with improperly constructed S-boxes. The experiments with a backtracking search algorithm performing this kind of attack against modified DES/Triple-DES in ECB mode show that the unknown plaintext can be recovered with a small amount of uncertainty and this algorithm is highly efficient both in time and memory costs for plaintext sources with relatively low entropy. Our investigations demonstrate once again that modifications resulting to S-boxes which still satisfy some design criteria may lead to very weak ciphers.ACM Computing Classification System (1998): E.3, I.2.7, I.2.8.
In this work we show the relationship between three types of tasks -classification, fault diagnosis and combinatorial testing. We show that these tasks have common idea to find the minimal test sets, which are sufficient for their goals. The first task is classification on the base of terminal tests voting. The second task is to identify the category with minimal, but unique vector of values. The third task is to find minimal number of configurations of parameters for testing, which include all pair (or t-way) interactions for fault-triggering. All they have application for product evaluation. We show a practical way to approach these tasks by converting them to a SAT problem and using a SAT solver to effectively find solutions.
One of the important tasks of the EU ELOST project on E-government and Low Socio-Economic Status Groups (LSG) was to compare experts’ opinions on fundamental problems of the subject. This papers shows how the application of specific classification methods to experts’ formalized answers could lead to some non-trivial and objective conclusions about interdependencies and the interrelation between e-government policies/tools and experts’ background and country affiliation.
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