Method and apparatus for determining document authenticity

1. Field of the Invention A method and apparatus for verifying the authenticity of a document relative to a previously programmed document are disclosed. The method provides a broadband light source; illuminates a document with the light source; collects reflected light; converts it into a corresponding electrical signal or signals; digitizes the electrical signals; and prepares a spectral signature of the document for further analysis. The spectral signature can also be normalized to account for variations in analyzed documents caused by soiling and fading. The method also provides for comparing a previously programmed and stored spectral signature to the spectral signature of a test document using a matching value to indicate whether the test document is authentic or not. The apparatus provides a device for application of the method for verifying document authenticity.