HESY is a handwriting recognition system for all conventional pens. The writing area is supported on four load cells and the invisible pressure and time sequences of the writing sample that are unique to each person and cannot be faked are recorded in four dimensions during writing.
A digital signature that is produced by your own hand is thus created by HESY. It is encrypted using suitable mathematical algorithms and attached inseparably to the document. The signature or a password written by your own hand is used. The so-called "digital blueprint" that can be created with HESY makes it possible for a member of the public, customer or guest to sign the usual piece of paper with his or her own hand. This ensures the authenticity and unique ownership of the written items. This also provides a piece of evidence that can be used in court – the businessman, hotel or official authorities no longer require any actual paper. It is thus very cost-effective to archive, and easy to integrate into existing document management (DMS) or workflow management systems and likewise to provide a piece of evidence in electronic form that can be used in court, such as a hotel booking note. Both documents include the unique and identical values of the writing dynamics; it is not possible for anyone else to make a new copy or version; once written, the signature is unique and cannot be reproduced. The partner can likewise sign both documents to meet more stringent security requirements. This provides a degree of security that creates a high degree of trust and confidence at a very low price.

The recording and evaluation of the writing dynamics is a procedure that can be listed without further ado under the heading of biometric recognition methods - ultimately you need to have "knowledge" of the name or the password and the unmistakable, individual and behaviour-based writing dynamics to either recognize an authorized person or to block out an unauthorized one.

For that reason the use of a so-called "value-dependent ID field" has been proposed. Tiresome rejections of authorized persons due to low values would be avoided. But the user would be perfectly willing to sign once or twice more if need be in the case of higher values. This is a perfectly normal procedure and one that we are already used to - we are much more concerned about our wallets if they contain not just 50 Euro but the princely sum of 5,000 Euro! The mathematician has a number of tricky tasks to solve as well when it comes to a "value-dependent ID field".
Since multimodal systems have considerable advantages over a single solution for biometric or behaviour-based identification, it is thus logical to make use of the typing dynamics that are typical for each individual person when it comes to inputting a PIN.

In the same way as for the "electronic signature" (elsig) under the German signatures law, "knowledge" of a multi-number PIB (at least 6, and preferably 8 to 10 digits) or conventional passwords that are typed in can be used in addition to "possession" (of a Smartcard). We would also like to say at this point that it is useless to try to spy out the entry procedure - the invisible typing dynamics cannot be imitated as such. The unique and clear statement of intent of one’s own signature is, in addition to being a form of unique identification, no longer a wasted item but instead the main part of the application.

HESY can be used as an "analog keyboard", either with or without recording of the typing dynamics, e.g., in any bank ATM or installed in all cases where keypads or keyboards are used to input a PIN. It is then left up to the customer to decide whether to input his PIN in the conventional way or whether to personalize it via the typing dynamics.

Anyone wishing to use HESY to authenticate a digital or electronic signature according to the law and to genuinely identify the signatory can also use a random number generated biometrically in addition to the signature data. The option of biometric random number generators would almost certainly not be so easy to implement with any other type of identification procedure.