Date Added: Nov 2012
A new design strategy for block ciphers based on the same techniques that are used to protect block ciphers against linear cryptanalysis. Here shows a carefully designed linear structure can be surprisingly efficient in diffusing the nonlinearity of very few small nonlinear components. Based on this strategy, the authors developed a new small and efficient encryption/decryption algorithm. This paper examines the comparison between new encryption/decryption block cipher algorithms with the existing one. Moreover this paper presenting a relational database system based on proposed encryption schemes to preserve the integrity and confidentiality of the data.