Secure scan design with Isomorphic registers

In this paper, we first introduce Isomorphic Redundancy concept. Two functionally equivalent shift registers can be Isomorphic to each other. They can be equivalent to each other by simple permutation of states m state tables. Two Isomorphically redundant circuits can be used to prevent two bit change insertion attack. In, addition we also propose a new model with the help of functionally equivalent shift registers. It is highly non-linear and scan-secure model.