Cryptographic method of protecting an electronic chip against fraud

The invention related to a method for protecting electronic chips from cheating, and includes an electronic chip device, the device is suitable for protecting the electronic chip from fraud. The method including:-mixed (1) these entered parameter (Em) in the of some or all parameter to provides a output data items e ′ = (e ′ 1,e ′ 2,...,e ′ n,...,e ′ n); will a limited State automatically device of State from old state change (2) for new State, the new State is the data items (e ′ 1,e ′ 2,...,e ′ n,...,e ′ n) of function, And thanks to the automatic installation of at least one State output function as an input parameter to calculate (3) a copy of the certificate (s). The devices include: mixers, finite-state devices automatically and used to calculate a certificate (s) and output device.