Zhaneta Tasheva

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The need of software-flexible stream ciphers has led to several alternative proposals in the last few years. One of them is a new Pseudo Random Number Generator (PRNG), named N-adic Summation-Shrinking (NSumSG), which architecture is described in this paper. It uses N-1 parallel working slave summation generators and one N-adic summation generator,(More)
The need for stream ciphers in communication and information cryptographic systems is rapidly grown in the last twenty years. The stream ciphers usually use a pseudo-random number generator with large period, large linear complexity and good statistical properties. At present a small number of software-oriented stream ciphers are known. Due to this reasons(More)
A new construction of a cryptographic generator which produces a p-ary pseudo random sequence (PRS) is proposed in this paper. The special features of architecture, called Generalized Shrinking-Multiplexing Generator (GSMG), are analyzed. The new method transforming an output p-ary GSMG sequence into binary is investigated. Finally, it is proofed that the(More)
To be suitable for use in aerospace cryptographic systems software-oriented stream ciphers must be fast, uniform, scalable, consistent and unpredictable. With regard in the paper the software implementation of a fast stream cipher, named Self−Shrinking p−adic Generator which produces 8 bits (SSPG-8) in one clock cycle, is proposed. The theoretical base of(More)
An algorithm for fast software encryption is proposed in this paper. It is based on the architecture of new pseudo random number generator (PRNG), named Self−Shrinking p–adic Generator (SSPG). In the paper first, the basic SSPG architecture and algorithm are recalled. Then, the software implementation in Visual C++ environment is presented. Finally, the(More)
The spread spectrum signals have large application in modern personal communication systems, but they must meet many requirements such as: complex pseudorandom structure, ideal autocorrelation function, close to zero cross-correlation function for all of the signals used in the communication system. With regard to these requirements, recently some theorists(More)
The sequences with complex pseudorandom structure, ideal autocorrelation function, close to zero cross-correlation function for all possible pairs of sequences from a set have extreme importance for several practical applications, such as communications, radars and cryptanalysis. As a result, the sequences with mentioned abilities are intensively studied(More)
The experience, obtained in the local military conflicts during the past twenty years, shows persuasively that the radioelectronic war has great importance for the combat success. Due to this reason, the radiocommunication systems, including radars, are high priority targets. After finding of their location they are attacked immediately. For their(More)
The information distortions during the signal processing at the receivers of a communication system are very undesirable, because they can be compensated only by means of increasing of transmitted energy. This leads to decreasing of system secrecy and its effectiveness. Due to this reason in our paper we suggest a mathematical algorithm for processing of(More)
The most valuable feature of the of the communication signals is the level of their side lobes, because it determines some of the most important system characteristics. With regard, tremendous efforts have been taken in order to develop methods of synthesis of signals, which auto-correlation function is similar to a delta pulse. Despite of this, at present(More)