Electronically signing a document

For an electronic signature device comprising a processor, a memory having a biometric electronic template stored therein, a user interface comprising a biometric signature input device, a device interface adapted to interface a computer, and at least one bus operably connected to the processor, the memory, the user interface, and the device interlace, a method of originating an electronically signed transaction, said method comprising:

• verifying whether a user is permitted to originate the electronically signed transaction with the electronic biometric signature device, comprising
• receiving a digitized biometric originator signature via the user interface, and
• comparing said digitized biometric originator signature against the biometric electronic template to produce a first verification result;
• receiving a transaction package through one of the user interface and the device interface;
• combining said transaction package and one of said digitized biometric signature and a digitized biometric user signature extracted from the biometric electronic template to produce an originator biometric signature block;
• generating a cryptographic key;
• encrypting said originator biometric signature block with said cryptographic key to produce an encrypted biometric signature block;
• combining said encrypted biometric signature block and said cryptographic key to produce an electronically signed transaction;
• and
• if the user is verified, providing said electronically signed transaction via the device interface;
• wherein the memory further has a biometric electronic template, a prime parameter, a sub-prime parameter, and a base parameter, user public data comprising a user public key, and a user private key stored therein, wherein generating a cryptographic key includes
• generating an ephemeral private key based on the prime, subprime, and base parameters;
• generating an ephemeral public key based on said ephemeral private key and the prime and base parameters;
• and
• generating a shared encryption key based on said ephemeral public key, the user public key, and the prime parameter;
• wherein the cryptographic key is a shared encryption key;
• and
• wherein said ephemeral private key, the prime parameter, and at least a portion of the user public data are combined with said encrypted biometric signature block and said cryptographic key to produce the electronically signed transaction.