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Digital signatures for communications using text-independent speaker verification

  • US 8,751,233 B2
  • Filed: 07/31/2012
  • Issued: 06/10/2014
  • Est. Priority Date: 12/21/2005
  • Status: Active Grant
First Claim
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1. A method comprising, performing at an authentication service system:

  • receiving an authentication session invitation request from a sender of an email, wherein the email is sent to a destination address of a recipient, and wherein the authentication session invitation comprises an email address of the sender and an invitation to create an authentication certificate for the sender and the email;

    sending, to the sender, a session identification and a text-phrase prompt comprising a text phrase;

    receiving, from the sender in response the text-phrase prompt, the destination address of the recipient and an audio signal;

    retrieving, based on the email address of the sender, a voice template associated with the sender;

    comparing the audio signal to the voice template, to yield a confidence score;

    when the confidence score exceeds a threshold;

    generating the authentication certificate; and

    packaging the session identification with the authentication certificate, to yield authentication information;

    when the confidence score does not exceed the threshold, packaging the session identification and the confidence score as the authentication information; and

    transmitting the authentication information to the destination email address of the recipient.

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