Abstract-Threshold cryptography is a novel cryptographic technique sharing secret among members. It divides a secret key into multiple shares by a cryptographic operation. This technique is useful to provide a shared secret key to legitimate nodes in a infrastructure-less mobile ad-hoc network (MANET). As an additional component, Proactive Secret Sharing (PSS) allows a set of nodes holding shares to refresh all shares by generating a new set of shares for the same secret key from the old shares without reconstructing the secret key. It is necessary to reasonably escape from threats of exposing the secret key when threshold cryptography is used.In this paper, we design the PSS protocol implementation specification in a MANET environment. In our scheme all share holder nodes synchronize the PSS procedure in a well-managed fashion to keep the protocol consistency. We then introduce our actual implementation and evaluate the behavior and its performance criteria.

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The goal of the publication is to test the random codes generator of the built-in crypto-protection system Following the list of critical technologies in the production of weapons field and military equipment (following the Decree of the Cabinet of Ministers of Ukraine dated 30.08.2017 No. 600-r), an embedded microcontroller system for the protection of information for on-board equipment has been developed. A valuable stage of the system introduction is its research and testing. One of the stages of testing is the verification of the generator of random codes to use for the generation of encryption keys and digital signatures. Based on the previous works and research of the Kalyna algorithm, methods and tools for creating a random code generator have been studied to use in the built-in cryptographic data protection system for data encryption/decryption and for working with a digital signature. Means of checking generated random codes and comparing them with existing counterparts have been developed. The purpose of this article is to check the generator of random codes before using it in the built-in information protection system.

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Ліванський міжнародний університет, кафедра електротехніки та електронної інженерії 2 Національний університет "Львівська політехніка" кафедра електронних обчислювальних машин