Information Leakage of VGF2 Structure

Ting Cui, Chen-hui Jin, Ke-feng Huang
2013 Mathematical Problems in Engineering  
The block cipher VGF2 was designed at Inscrypt 2009. It was based on a new variant of generalized Feistel structure. By checking the property of the linear permutation, we find a full round differential in VGF2 with probability 1. Since this differential cannot distinguish the correct unknown key from the wrong keys, we fail in launching a key-recovery attack on this structure. However, we may guess half part of the plaintext without calculating the key. And we notice that this weakness may
more » ... is weakness may cause insecurity in some special environments.
doi:10.1155/2013/962342 fatcat:lkiewvvabncxrf3uwmq3g7ivqy