Structure comprising a fibrous material substrate and method for authenticating and/or identifying such a structure

A structure comprising:

• a fibrous material substrate,
• a plurality of heterogeneous elements associated with the fibrous material substrate and having random dispersion with regard to the fibrous material substrate, wherein the plurality of heterogeneous elements have, at least in a predefined zone of the structure, a density of from 1 to 100 heterogeneous elements per cm2 and
• a first information having a relationship with at least one spatial characteristic and/or physical feature of at least a portion of the plurality of heterogeneous elements,
• wherein the first information is encrypted.

A structure comprising:

• a fibrous material substrate,
• a plurality of heterogeneous elements associated with the fibrous material substrate and having random dispersion with regard to the fibrous material substrate, wherein the plurality of heterogeneous elements have, at least in a predefined zone of the structure, a density of from 1 to 100 heterogeneous elements per cm2 and
• a first information having a relationship with at least one spatial characteristic and/or physical feature of at least a portion of the plurality of heterogeneous elements,
• wherein the structure further comprises an information medium storing the first information electronically or on which the first information is present in printed form.

A structure comprising:

• a fibrous material substrate,
• a plurality of heterogeneous elements associated with the fibrous material substrate and having random dispersion with regard to the fibrous material substrate, wherein the plurality of heterogeneous elements have, at least in a predefined zone of the structure, a density of from 1 to 100 heterogeneous elements per cm2 and
• a first information having a relationship with at least one spatial characteristic and/or physical feature of at least a portion of the plurality of heterogeneous elements,
• wherein the spatial characteristic(s) and/or physical feature(s) is related to a position, orientation, frequency, shape, size or density per unit surface of the plurality of heterogeneous elements or corresponds to an optical, an electrical, an electromagnetic, a thermal or an acoustical feature related to the plurality of heterogeneous elements.

A structure comprising:

• a fibrous material substrate,
• a plurality of heterogeneous elements associated with the fibrous material substrate and having random dispersion with regard to the fibrous material substrate, wherein the plurality of heterogeneous elements have, at least in a predefined zone of the structure, a density of from 1 to 100 heterogeneous elements per cm2
• a first information having a relationship with at least one spatial characteristic and/or physical feature of at least a portion of the plurality of heterogeneous elements, and
• a medium separate from the structure storing the spatial characteristic(s) and/or physical feature(s),
• wherein the first information represents an identifier for recovering the spatial characteristic(s) and/or physical feature(s) stored on the medium separate from the structure.

A structure comprising:

• a fibrous material substrate,
• a plurality of heterogeneous elements associated with the fibrous material substrate and having random dispersion with regard to the fibrous material substrate, wherein the plurality of heterogeneous elements have, at least in a predefined zone of the structure, a density of from 1 to 100 heterogeneous elements per cm2
• a first information having a relationship with at least one spatial characteristic and/or physical feature of at least a portion of the plurality of heterogeneous elements, and
• a medium storing the spatial characteristic(s) and/or physical feature(s),
• wherein the first information represents an identifier for recovering the spatial characteristic(s) and/or physical feature(s) stored on the medium.

A structure comprising:

• a fibrous material substrate,
• a plurality of heterogeneous elements associated with the fibrous material substrate and having random dispersion with regard to the fibrous material substrate, wherein the plurality of heterogeneous elements have, at least in a predefined zone of the structure, a density of from 1 to 100 heterogeneous elements per cm2, and
• a first information having a relationship with at least one spatial characteristic and/or physical feature of at least a portion of the plurality of heterogeneous elements,
• wherein the first information represents an image of the plurality of heterogeneous elements or contains recovery information configured to enable recovery of the image of the plurality of heterogeneous elements.