The security of GOST R 34.11-2012 against preimage and collision attacks

In January 2013 the National standard of the Russian Federation GOST R 34.11-94 defining the algorithm and computational procedure for hash function was replaced by GOST R 34.11-2012. A family of hash functions Streebog was approved as a new standard. We analyse the family Streebog from the mathematical cryptography viewpoint and prove that it is secure against preimage and collision attacks.