Design of a New Stream Cipher: PARS
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In this paper, a new stream cipher is designed as a clock-controlled one but with a new mechanism of altering steps based on system theory in such a way that the structures used in it are resistant to conventional attacks. Our proposed algorithm (PARS) uses the main key with the length of 256 bits and a 32-bit message key. The most important criteria considered in designing the PARS are resistance to known attacks, maximum period, high linear complexity, and good statistical properties, so the output keystream is very similar to the perfectly random sequences and resistant to conventional attacks such as correlation attacks, algebraic attack, divide & conquer attack and time-memory tradeoff attack. The base structure of the PARS is a clock-controlled combination generator with memory and we obtained all the features according to design criteria with this structure. PARS can be used in many applications, especially for financial cryptography due to its proper security features.
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