Inspec keywords: group theory; cryptography; Galois fields; linear programming; image processing; statistical analysis

Other keywords: linear fractional transformation; Galois field; statistical attacks; nonlinearity; substitution box; algebraic attacks; approximation probabilities; constrained linear fractional transformation; image encryption applications

Subjects: Other topics in statistics; Algebra; Optimisation techniques; Algebra; Computer vision and image processing techniques; Optimisation techniques; Other topics in statistics; Data security; Optical, image and video signal processing; Cryptography theory