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##About GOST 28147-89
The GOST block cipher, defined in standard GOST 28147-89, is a Soviet and Russian
government standard symmetric key block cipher. Developed in the 1970s, the standard
has been marked ”Top Secret” and the downgraded to ”Secret” in 1990. Shortly after the
dissolution of the USSR, it was declassified and it was released to the public in 1994.

##This project
This project has implements GOST block cipher in three modes:

* electronic codebook (ECB)
* cipher feedback (CFB)
* message authentication code (MAC)