Practical-Time Related-Key Attack on GOST with Secret S-boxes

ePrint Report: Practical-Time Related-Key Attack on GOST with Secret S-boxes

Orr Dunkelman, Nathan Keller, Ariel Weizman

The block cipher GOST 28147-89 was the Russian Federation encryption standard for over 20 years, and is still one of its two standard block ciphers. GOST is a 32-round Feistel construction, whose security benefits from the fact that the S-boxes used in the design are kept secret. In the last 10 years, several attacks on the full 32-round GOST were presented. However, they all …

attack attacks benefits block cipher ciphers construction design encryption encryption standard eprint report fact key report russian russian federation secret security standard