Hrytsak A. Methods for effective cryptographic hash functions construction

The dissertation is devoted to solving the actual scientific problem of developing and researching new effective hash functions that will provide the necessary level of the security with a sufficiently high speed. The analysis of modern methods and algorithms for the construction and implementation of effective cryptographic hashing functions was carried out, which made it possible to identify their shortcomings and formalize the tasks of scientific research. A method of constructing hashing functions was developed, which made it possible to increase the speed of cryptographic data processing. A method of constructing hashing functions was developed, which made it possible to provide resistance to cryptanalytic attacks. The method of pseudorandom number generators construction has been improved, which allowed forming a statistically stable range for cryptographic applications. The method of cryptographic protection of information has been improved, which by means of fixing information on user ID, session ID, time of sending, length of message and its serial number, as well as use of the new procedure of formation of session key and encryption, made it possible to ensure confidentiality and integrity of data in the modern information and communication systems and technologies. Last chapter of the dissertation contains research study devoted to collision characteristics of proposed hash functions using so-called “baby versions” of hashing functions based on the existed experimental technique (relevant in cryptography). Specialized software was developed in the form of console applications in C ++ programming language (Microsoft Visual Studio 2013 (Release Version)) and a technique that allowed us to conduct experiments and verify the proposed methods. the results of the dissertation are used in the educational process of Vinnytsa National Technical University (to increase the efficiency of training of specialists in the specialty 125 “Cybersecurity”) as well as in scientific process of National Aviation University and Educational & Research Complex “Information and Communication Systems”. It was confirmed by the acts of implementation.