The result of experiment show that this algorithm has good robust against JPEG,and frangibility against the familiar attacks,and beseem to selective authentication for image.
Given a robust 52-bit password, you can then use a password manager to take care of the dozens of easily guessable ones used to access various web services.
It should be noted that the method for updating multipliers is similar but different to the surrogate subgradient method, which is more robust and stable for accelerating the convergence rate.