A Biologically Inspired Approach to Protecting and Verifying the Authenticity of Important Documents

An approach to the protection and verification of important documents, primarily on paper based on the so-called biosignature (BS), is presented. BS is a further development of document protection technology with the help of speech signature (SS). SS is a fragment of an image embedded in a document. The SS image contains a spectrogram of the speech message of the author of the document, which is used to verify its contextual content, as well as to identify the author’s identity. The main disadvantage of SS was revealed, which consists in the limited possibilities for transmitting the author’s bioparameters, which make it possible to identify his functional and psycho-emotional state. Fixing the state of the author at the time of its preparation or signing makes it possible to identify cases of obtaining a signature under duress, as well as in case of inappropriate behavior of the author, including the author being under the influence of drugs or alcohol, which is the basis for recognizing the document as falsified. Two possible options for the transmission of biometric information as part of the BS are analyzed. It is shown that the transfer of time dependences of the dynamics of changes in bioparameters at the time of signing the document is the most preferable in terms of noise immunity from random pixel noise due to the applied printing technology for manufacturing the document.