Research On Inversion Attack On Feedforward Models

The research is focused on inversion attack on feedforward model of a linear feedback shift register with division circuit and generalized feedforward model founded on linear recursion sequence, so that advice on being resistant to inversion attack is presented.The research work is as following.Inversion attack on feedforward model of a linear feedback shift register with division circuit is advanced.Four detailed inversion attack algorithms are given in two ideas according to two terms, and on the basis of analyzing complexities of algorithms, advice on being resistant to inversion attack is presented.Idea that changing division circuit into multiplication circuit is advanced, and a translating form is found at present.Inversion attack is generalized.1. A conception of V matrix is advanced and feedforward model founded on V matrix is constructed.Inversion attack on feedforward model founded on V matrix is analyzed and detailed inversion attack algorithms and complexities of these algorithms are given, advice on being resistant to inversion attack is presented on the basis of complexities.2. Feedforward model founded on M matrix is constructed.Inversion attack on feedforward model founded on M matrix is analyzed and detailed inversion attack algorithms and complexities of these algorithms are given, advice on being resistant to inversion attack is presented on the basis of complexities.3. Feedforward model founded on linear recursion sequence is constructed. Inversion attack on feedforward model founded on linear recursion sequence is analyzed and advice on being resistant to inversion attack is presented on the basis of analysis.