Among other concepts, this disclosure describes a thermal/optical/electronic authentication system (covert or non-covert) for device/system implementations. The authentication system may be based on different design parameters such as i) materials composition, ii) thickness of material, iii) geometry of material, iv) external effects including use of an external DC bias and curing, etc. The authentication testbeds can be configured to include one or more inks. Using such methods as discussed herein, the authentication can be broadened to include near-IR (700-900 nm), short wave IR (1-2.6 mm), and UVA (300-400 nm) or any spectrum. Printed resistors are very difficult to duplicate without Ag-BST13 ink. If necessary, a printed resistor network on a respective substrate can be hidden using a layer of non-sintered Ag-BST13 (non-conductive).

Among other concepts, this disclosure describes a thermal/optical/electronic authentication system (covert or non-covert) for device/system implementations. The authentication system may be based on different design parameters such as i) materials composition, ii) thickness of material, iii) geometry of material, iv) external effects including use of an external DC bias and curing, etc. The authentication testbeds can be configured to include one or more inks. Using such methods as discussed herein, the authentication can be broadened to include near-IR (700-900 nm), short wave IR (1-2.6 mm), and UVA (300-400 nm) or any spectrum. Printed resistors are very difficult to duplicate without Ag-BST13 ink. If necessary, a printed resistor network on a respective substrate can be hidden using a layer of non-sintered Ag-BST13 (non-conductive).

Provided is a security assembly including at least one substrate element, at least one first pattern, and at least one second pattern. The at least one first pattern is associated with the at least one substrate element. The at least one first pattern is at least in part translucent or transparent. The at least one second pattern is associated with the at least one substrate element. Each of the at least one first pattern overlaps at least in part the at least one second pattern. Upon viewing the assembly, the at least one first pattern and the at least one second pattern are configured to generate, at at least one side of the assembly, at least one third pattern, each of the at least one third pattern including an optically variable image. Other embodiments disclosed.

Provided is a security assembly including at least one substrate element, at least one first pattern, and at least one second pattern. The at least one first pattern is associated with the at least one substrate element. The at least one first pattern is at least in part translucent or transparent. The at least one second pattern is associated with the at least one substrate element. Each of the at least one first pattern overlaps at least in part the at least one second pattern. Upon viewing the assembly, the at least one first pattern and the at least one second pattern are configured to generate, at at least one side of the assembly, at least one third pattern, each of the at least one third pattern including an optically variable image. Other embodiments disclosed.

A security element comprising a first and a second pattern formed in or on a substrate is described, the first pattern (105; 205) being formed by discrete elements (105a-105g; 205a-205c) of a first material that are distributed over a first region (101) of the substrate (100; 200), the second pattern (106; 206) being formed by discrete elements (106a-106i; 206a-206c) of a second material that are distributed over a second region (102) of the substrate (100; 200), said second material being different from said first material, said first and second regions of the substrate overlapping, wherein the discrete elements of at least one of the first and second patterns are distributed randomly, a part of the discrete elements of the first pattern (105; 205) overlap with a part of the discrete elements of said second pattern (106; 206), and the security element is defined by the first pattern (105; 205), the second pattern (106; 206) and a third pattern (107; 207) associated with the overlap of some or all of the discrete elements of said first and second patterns.

A security element comprising a first and a second pattern formed in or on a substrate is described, the first pattern (105; 205) being formed by discrete elements (105a-105g; 205a-205c) of a first material that are distributed over a first region (101) of the substrate (100; 200), the second pattern (106; 206) being formed by discrete elements (106a-106i; 206a-206c) of a second material that are distributed over a second region (102) of the substrate (100; 200), said second material being different from said first material, said first and second regions of the substrate overlapping, wherein the discrete elements of at least one of the first and second patterns are distributed randomly, a part of the discrete elements of the first pattern (105; 205) overlap with a part of the discrete elements of said second pattern (106; 206), and the security element is defined by the first pattern (105; 205), the second pattern (106; 206) and a third pattern (107; 207) associated with the overlap of some or all of the discrete elements of said first and second patterns.

An original document is formed using a first print medium by printing a first and second monochrome patterns with a single colorant to form printed first and second regions including first and second shapes, respectively, which are devoid of the colorant. The second shapes have a smaller size and a higher frequency than the first shapes. The first and/or second regions encode information. The first and second patterns and a fluorescence of the first print medium are selected such that the first and second regions of the original document are indistinguishable to the naked eye, under both normal and ultraviolet illumination but are distinguishable, only under the ultraviolet illumination, in a copy formed by scanning the original document and printing the scanned document on a second print medium with a plurality of colorants, to reveal the encoded information.

An anticounterfeiting device having a film stack including functionalized microstructures and nanostructures that produces overt and covert features under ambient visible and ultraviolet light, as well as methods of use and construction are disclosed herein.

An anticounterfeiting device having a film stack including functionalized microstructures and nanostructures that produces overt and covert features under ambient visible and ultraviolet light, as well as methods of use and construction are disclosed herein.

A security document with unidirectional visual illumination is disclosed. A security feature is positioned within the document and not visible in normal ambient lighting conditions but becomes visible under specialized lighting conditions, for example in the presence of ultraviolet light. The security feature is constructible such that it is visible only from a single side of the security document, with the side being predeterminable regardless of the orientation of the specialized light.