The Streebog hash family, specified in the GOST R 34.11-2012 specification, is a set of cryptographic hash functions standardized by the Russian government. Streebog is named after the Russian word "Streegog," which means whirlpool or vortex. Streebog should not be confused with any of the GOST hash family, which are described in other documents.

The Streebog hash functions are based on the Merkle–Damgård construction with a compression function that utilizes bitwise Boolean operations and modular addition. Streebog has been adopted for various applications, including secure communications, digital signatures, and authentication, particularly in Russian cryptographic systems and protocols. However, its usage outside Russia is relatively limited compared to widely accepted international standards like SHA-2 and SHA-3.

Details about the specification can be found in the IETF RFC 6986 https://datatracker.ietf.org/doc/rfc6986/.