Abstract: A process for simultaneously checking the authenticity of information media and the authenticity of the information itself which involves scanning a portion of the information written on the media. The results of the scan are transformed into an electrical signal. The signal is analyzed by an appropriate algorithm that registers variations between the information as actually written and a theoretically perfect writing of the same information. The results of this analysis can be stored in the memory of the scanning apparatus or directly onto the media. Then each time the media is handled, the same section of information is rescanned, identically analyzed, and compared to the stored results of the initial scan.

Abstract: A process and apparatus for transmission of coded information that permits information to be applied on or integrated into, any data carrier, so as to incorporate its clock cycle or reading clock. The invention offers a thoroughly reliable system having simple and low cost embodiments as far as the coding means are concerned, by the use of characters or signs of general utilization such as the characters of an alphabet. A process of transmission of coded information, characterized by utilizing any suitable device to apply or incorporate a sequence of m packs of positions of characters of signs into a data carrier.

Abstract: A process controlling the use of a document reserved to the titleholder along or to the authorized bearer, and is characterized by consisting prior to the activation of the document in integrating into a predetermined zone of the document a predetermined and random coded transcription of a set of letters and/or digits constituting a secret "word" known only to the titleholder, the coded data being spread across a matrix of n rows and p columns, in comparing at the time the document is used the coded data with a "word" issued by the document bearer following the transcription in the same code, and in determining and displaying whether in there is coincidence or not.The process applies in particular to checks or the like. The invention also relates to the documents and the coding and reading means designed or developed to implement this process.