Methods of generic attacks infeasibility increasing for hash functions

This work is devoted to the multicollision attacks analysis. Known methods of the multicollision attacks counteraction are considered and main trends of these methods development are determined. Methods of data blocks bonding and hash constructions for their implementation are proposed. Theoretical infeasibility analysis of constructions based on these methods is performed and it is shown, that for proposed constructions collision attack for the certain data block is added up to the preimage attack.