GOST Hash Tool
Other Hash Generator
MD2 MD4 MD5 SHA1 SHA224 SHA256 SHA384 SHA512/224 SHA512/256 SHA512 SHA3-224 SHA3-256 SHA3-384 SHA3-512 RIPEMD128 RIPEMD160 RIPEMD256 RIPEMD320 WHIRLPOOL TIGER128,3 TIGER160,3 TIGER192,3 TIGER128,4 TIGER160,4 TIGER192,4 SNEFRU SNEFRU256 GOST GOST-CRYPTO ADLER32 CRC32 CRC32B CRC32C FNV132 FNV1A32 FNV164 FNV1A64 JOAAT MURMUR3A MURMUR3C MURMUR3F XXH32 XXH64 XXH3 XXH128 HAVAL128,3 HAVAL160,3 HAVAL192,3 HAVAL224,3 HAVAL256,3 HAVAL128,4 HAVAL160,4 HAVAL192,4 HAVAL224,4 HAVAL256,4 HAVAL128,5 HAVAL160,5 HAVAL192,5 HAVAL224,5 HAVAL256,5The GOST algorithm is a symmetric key block cipher developed by the Soviet Union, widely used in cryptographic applications. It operates on fixed-size data blocks of 64 bits and uses a key length of 256 bits. The encryption process involves multiple rounds of transformations and substitutions, ensuring high security through a combination of permutation, modular arithmetic, and non-linear operations.
Key Components
The algorithm utilizes a series of 32 rounds, where each round applies a set of mathematical transformations to the input data block. The core elements include:
- Substitution Boxes (S-Boxes): Predefined tables that replace input bytes with output bytes to provide non-linearity.
- Modulo Addition: Each 32-bit half of the block is added to the corresponding key segment modulo 232, producing a transformed value.
- Bitwise Rotations: Circular shifts of the result by 11 bits, enhancing diffusion across the block.
Encryption Process
The input block is divided into two 32-bit halves. For each round, the left half is combined with the round key using modulo addition, substituted via S-Boxes, and rotated. The resulting value is XORed with the right half. After all rounds, the halves are swapped, producing the final encrypted block.
Decryption Process
Decryption mirrors the encryption process, applying the same operations in reverse order using the same key schedule. The S-Boxes and key sequence ensure that reversing the transformations accurately restores the original plaintext.
Key Schedule
The 256-bit key is split into eight 32-bit segments. For encryption, these segments are used in a specific order repeated over the 32 rounds. This repetition ensures uniform distribution of key material across all rounds, enhancing resistance to cryptanalysis.
Security Considerations
GOST provides a strong balance of substitution and permutation operations. Its 32-round structure, combined with large key size, prevents linear and differential attacks. Proper implementation requires careful management of S-Boxes and adherence to the specified round sequence.