This document describes the cryptographic algorithms and parameters supplementary to the original GOST specifications GOST 28147-89, GOST R 34.10-94, GOST R 34.10-2001 and GOST R 34.11-94 for use in internet applications. Table of

This document describes the cryptographic algorithms and parameters supplementary to the original GOST specifications GOST 28147-89, GOST R 34.10-94, GOST R 34.10-2001 and GOST R 34.11-94 for use in Internet applications. Table of

Defined in the standard GOST 28147-89, GOST is a Soviet and Russian government standard symmetric-key block cipher. GOST has the 64-bit block size and a key length of 256 bits. It is a Feistel network of 32 rounds. In 2010, GOST was submitted to ISO 18033 to become a worldwide industrial encryption standard. GOST 28147-89 has also been published as informational RFC 5830 with IETF. In this pape...

The block cipher GOST was proposed in former Soviet Union in 1989. In this paper we present the principal algorithm of GOST block with reduced number of rounds. By introducing the idea reduced round version of GOST the modules speed processing of using a set of differential characteristics, we can simply increase the effectiveness and estimate the efficient for cryptosystem. We describe GOST an...

In this paper, we present improved preimage attacks on the reduced-round GOST hash function family, which serves as the new Russian hash standard, with the aid of techniques such as the rebound attack, the Meet-in-the-Middle preimage attack and the multicollisions. Firstly, the preimage attack on 5-round GOST-256 is proposed which is the first preimage attack for GOST-256 at the hash function l...

In this article, we analyze the security of the GOST hash function. The GOST hash function, defined in the Russian standard GOST 34.11-94, is an iterated hash function producing a 256-bit hash value. As opposed to most commonly used hash functions such as MD5 and SHA-1, the GOST hash function defines, in addition to the common iterative structure, a checksum computed over all input message bloc...

The GOST hash function family has served as the new Russian national hash standard (GOST R 34.11-2012) since January 1, 2013, and it has two members, i.e., GOST256 and GOST-512 which correspond to two different output lengths. Most of the previous analyses of GOST emphasize on the compression function rather than the hash function. In this paper, we focus on security properties of GOST under th...

The block cipher GOST (GOST 28147-89) is a Russian standard for encryption and message authentication that is included in OpenSSL 1.0.0. In this paper, we present meet-in-the-middle attacks on several block ciphers, each consisting of 22 or fewer rounds of GOST. Our 22-round attack on rounds 10–31 requires only 5 known plaintexts and a computational effort equivalent to testing about 2 keys for...