S. Abrahamyan, M. Kyureghyan

Proceedings of International Scientific Conference “Computer Science and Information Technologies” CSIT 2009./Yerevan, RA, September28 — October2, 2009- p.109-111.

This paper presents a linear cryptanalytic attack against the SAFER family of block ciphers. Linear cryptanalysis is a statistical well-known-plaintext attack that explores (approximate) linear relations between plaintext, ciphertext and subkey bits. These linear relations apply only to certain key classes. The results show that by considering non-homomorphic linear relations, more rounds of the SAFER block cipher family can be attacked. The new attacks pose no threat to any member of the SAFER family.

M.V.Markosyan A.A.Hovhannisyan, V.G. Avetisyan

Proceedings of International Scientific Conference “Radiation and dispersion of electromagnetic waves” ИРЭМВ-2009./Taganrog – Divnomorskoye, Russia, 27th June — 1st July, 2009 – p.285-289.

Questions of complex qualifying of transmitter meshes (TM) of UHF of the active phased array, including testing of TM for functionality, testing of the polarization performances of waves radiated by meshes, qualifying of TM on conformity with demanded parameters for exclusion of defective TM from processes of mounting and assemblage of more integrated unit –module are considered. The designed technique of certification of assembled modules is given.

V.H. Avetisyan, M.V. Markosyan, A.A. Hovhannisyan, S.G. Eyramjyan

Experiment // Reports of National Academy and the State Engineering University of Armenia. Series of Technical Sciences,- 2008y. – Vol.61, №4, — Page 577-583.

Description of measurement stand of active phased array (APA) trial module, which consist of four elementary transmit-receive cells, and experimental research results are suggested. Measurement system, which permits measurement automation, is briefly described.

V.H. Avetisyan, M.V. Markosyan, A.A. Hovhannisyan, S.G. Eyramjyan

Experiment // Reports of National Academy and the State Engineering University of Armenia. Series of Technical Sciences,- 2008y. – Vol.61, №4, — Page 577-583.

Description of measurement stand of active phased array (APA) trial module, which consist of four elementary transmit-receive cells, and experimental research results are suggested. Measurement system, which permits measurement automation, is briefly described.

V.H. Avetisyan, M.V. Markosyan, A.A. Hovhannisyan, S.G. Eyramjyan

1. Testing methodology // Reports of National Academy and the State Engineering University of Armenia. Series of Technical Sciences,- 2007y. – Vol.60, №3, — Page 516-522.

The methodology of active phased array module testing is suggested. The module consists of four elementary receiving-transmitting cells, each of which contains an electronically controlled attenuator and phase shifter, power amplifiers, low-noise amplifiers and radiator, parameters of which are tested sufficiently simply by the suggested methodology.