Andrei Ovchinnikov

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In this paper the modification of McEliece public-key cryptosystem is considered, which uses the codes based on Plotkin construction as the private key, instead of Goppa codes traditionally considered for this purpose. Proposed modification allows strengthening of McEliece cryptosystem by attacks complication based on the secret code structure.
In this paper an attack on McEliece cryptosystem is considered. In this system the private and public keys are generator matrices of equivalent codes, i.e. they differ by fixed (secret) permutation. At the same time it is known that for every code there are the group of permutations preserving the code. Such code's structure may be used for analysis of(More)
— Advanced forward error correcting (FEC) and modulation scheme basing on low-density parity-check codes (LDPC) and adaptive bit loading (ABL) procedure is investigated for WLAN physical layer (PHY) of IEEE 802.11a standard. The main intention of the present paper is to study influence of the advanced PHY algorithms on the WLAN throughput under the(More)
In the paper the problem of metric description of processes defined by two-state Markov models is considered. The class of special metrics is presented, the approach of matching the metrics from this class with the Markov models is proposed. In the special case of simple Markov chain the metric matched with Markov chain for large set of its parameters is(More)
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