Patent ID: 7606768

Claim:
A method for electronically signing a document, comprising: by a first computing device, electronically obtaining a public key; receiving a spoken personal identification number (PIN) and generating a voice PIN from the spoken PIN; receiving a spoken intention to execute a document and generating a voice signature from the spoken intention to execute; encrypting the voice PIN using the public key; generating a polynomial hash based on the document, the voice signature and the encrypted voice PIN, wherein the polynomial hash varies with changes in at least the voice signature and the encrypted voice PIN; encrypting the hash using the PIN as an input to said encryption of the hash; and sending the document, the voice signature, the encrypted voice PIN, and the encrypted hash to a second computing device, the second computing device being of an intended recipient of the document, whereby the encrypted voice PIN is provided to the second computing device to allow, by the second computing device, i) generation, using the PIN resulting from a decryption of the encrypted voice PIN, of a comparative encrypted hash of the document, the voice signature, and the encrypted voice PIN for comparison with the encrypted hash, and ii) comparison of the voice of the voice PIN to the voice of the voice signature, such that no previously stored authentication data is necessary at the location of authentication.