A hyper chaos based encryption algorithm for data of network risk assessment

A hyper chaos based encryption algorithm for data of network risk assessment is designed in this paper. The size of plain group is variable and determined by the encryption rounds in the algorithm. In encryption procedure of the algorithm, the plaintext is first divided into groups of size k × 2ⁿ byte, then the plaintext is encryption group by group. For every plaintext group of k × 2ⁿ bytes, it is divided into 2ⁿ blocks of k bytes, after n rounds encryption transformation and one round permutation, the ciphertext group of k × 2ⁿ bytes is obtained. To improve the security of the algorithm, Chen´s system is iterated for several times before the encryption of every plaintext group. It´s from experiments and analysis that the algorithm is secure and valid.