Sažetak Kee** the proper security level of ciphers used in communication networks is
today a very important problem. Cryptanalysts ensure a constant need for improvement …

Modeling through Boolean encoding is often used for the investigation of various kinds of
algorithms or other computer systems. Such an approach can be used successfully to …

SAT based cryptanalysis is one of efficient ways to investigate about desire properties of
symmetric ciphers. In this paper we show our research and new experimental results in the …

There are many concepts and methods of ciphers cryptanalysis. It depends on the type of
the cipher investigated or sometimes modes of operations. Usually, cryptanalysts would like …

Many significant computational problems can be converted to SAT problems. Although these
problems are often encoded by formulas with hundreds of thousands of clauses and …

One of the applied methods of symmetric ciphers investigations is cryptanalysis that uses the
SAT problem. In this case, cipher testing starts with encoding the cipher's algorithm into a …

This paper proposes an attack on shift register based stream ciphers. The attack consists of
recovering the internal state of the registers at a starting clock instant from which the output …

Cryptanalysis of Bivium is presented with the help of a new Boolean system solver
algorithm. This algorithm uses a Boolean equation model of Bivium for a known keystream …

W dzisiejszych sieciach i systemach komputerowych, z oczywistych względów, wymaga się
zapewnienia odpowiedniej ochrony przesyłanych lub gromadzonych danych. Do celów tych …

Direct SAT-Based Cryptanalysis of Some Symmetric Ciphers Page 1 Cryptanalysis of symmetric
ciphers Feistel transformation and DES algorithm Boolean encoding Experiments and future …