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Method and System to uniquely identify the author of an ink signed or printed document Disclosure Number: IPCOM000199539D
Publication Date: 2010-Sep-08
Document File: 4 page(s) / 122K

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The Prior Art Database


The purpose of the invention is to embed an extra level of authentication within manually signed documents or printed documents.The invention proposes a mechanism that will allow the identification of a person that signs a paper, using a biometric based ink-based pen. The mechanism can also be extended to apply to any ink-based devices like printers.

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Method and System to uniquely identify the author of an ink signed or printed document

The main idea of the invention is to add chemical components/markers to the ink, in quantity based on the biometric of the person signing (or printing) the document. Those markers/chemical components will not alter the colour of the ink but will be mixed with the ink as it is released from the printing device (pen, printer etc).

    Once on the paper and dried, the ink will retain those markers/components according to the proportion as defined by the biometric value of the person. A spectrometric analysis of the printed ink will be able to establish the composition of the ink markers and an appropriate algorithm will recompute the biometric digest of the person that used the printing device. That value resulting from the document ink analysis can then be compared to the actual value of the person, based on its biometric, and establish whether that person used or not the printing device for the document.

    The following schemas and description applies a ink-based pen, but should be applicable to other devices like printers.

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    The unique aspect of the invention is its dynamic aspect: different people can use the printing device interchangeably and the composition of the resulting ink will be different, according to the biometric signature of each individual.

Phase 1: Using the device
Step 1: if necessary, the user can resets the biometric information previously registered with the printing device. This sends a reset signal to the core Processing Unit 'PU'. This optional step allows multiple users to re-use the same printing device. In the example, above, this is achieved using the reset button 'RB'

Step 2: the user supplies its own biometric information to the device. For example in the previous diagram, this is achieved using a fingerprint reader 'FR'. However, depending on the printing device being used, other mechanisms to supply a unique biometric signature can be used.

Step 3: the entered biometric information is supplied to the Processing Unit 'PU' via a


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Step 4 The Processing Unit 'PU' applies an algorithm A1 to the received biometric information that will create a unique digest D1. The digest is then translated into a set of proportions for the...