A method for producing a security feature and for authentication of a security feature as well as a security feature

The invention relates to a method for producing a security feature (4) by a first information as an open, machine-readable, the first graphic code (1) is provided, the first graphic code (1) is provided as a first image is available, there is provided at least one further information in at least one machine-readable additional graphic code (2, 3), which in a two-dimensional discrete complex function G (fx, fy) with a fx at least one further graphical code (2, 3) -Frequenzkoordinate and fy-frequency coordinate is embedded, the two-dimensional discrete, complex function g (fx, fy) is Fourier transformed to a two-dimensional discrete complex function g (x, y) and the function g (x, y ) is binarized to a second image and the first image and the second image are linked to each other, along both the frequency coordinates fx, fy, respectively fx_max a maximum frequency used, fy_m ax each a maximum achievable frequency and fx_limit be fy_limit determined along each coordinate a ratio Pfx = P f x _ m a x Pfx_limit . PFY = P f y _ m a x Pfy_limit is determined by a maximum unused frequency and maximum achievable frequency and the linked image with a pixel resolution of at least the smaller value of the two values 300 D P I Pfx . 300 D P I PFY is printed.