1. A method for verifying on authenticity of a security document, wherein said security document comprises a substrate and at least one perforation pattern in said substrate, the method comprising a step of acquiring a transmission mode image of at least a part of said perforation pattern of said security document by means of a verification device, and a step of verifying by means of said verification device said authenticity of said security document using said transmission mode image, wherein said perforation pattern comprises a plurality of perforations of at least a part of said substrate, and wherein to the naked eye of a human observer at least one of said perforations is not visible in a reflection mode.