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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...
In order to solve the problems of Gao algorithm, an improvement of Gao algorithm is proposed in this paper. Firstly, the shuffling procedure is combined with pixel diffusion to solve the problem that permutation isn't relative to the pixel values in Gao algorithm. Secondly, to solve the problem that the keystream isn't sensitive to plaintext in Gao algorithm, the feedback mechanism is introduced in...
A kind of dynamic opcode n-gram software birthmark is proposed in this paper based on Myles' software birthmark (in which static opcode n-gram set is regarded as the software birthmark). The dynamic opcode n-gram set is regarded as the software birthmark which is extracted from the dynamic executable instruction sequence of the program. And the new birthmark can not only keep the advantages of feature...
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