Patents by Inventor David Chaum

David Chaum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190005756
    Abstract: A method allows a random sample of a large population of voters to cast votes and for both the unpredictability/un-manipulability of the sample selection and the integrity of the tally to be verified by any interested parties using public information. The problem of vote selling is addressed. Also, a variant allows voters to remain substantially anonymous.
    Type: Application
    Filed: August 14, 2018
    Publication date: January 3, 2019
    Inventor: David CHAUM
  • Patent number: 10050786
    Abstract: A method allows a random sample of a large population of voters to cast votes and for both the unpredictability/un-manipulability of the sample selection and the integrity of the tally to be verified by any interested parties using public information. The problem of vote selling is addressed. Also, a variant allows voters to remain substantially anonymous.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: August 14, 2018
    Inventor: David Chaum
  • Publication number: 20180139190
    Abstract: Precomputed and transactional mixing is believed to allow portable devices, such as smart phones, to send and receive messages, with little extra bandwidth or battery usage, while achieving anonymity for senders and recipients among all messages sent globally in batches defined by short time intervals. To learn anything about which inputs correspond with which outputs of such a batch of messages, the entire cascade of mix devices, each preferably operating independently in a different country, would it is believed have to be compromised. None of the real-time computation, neither by the mixes nor smartphones, uses full public-key operations—resulting it is believed in orders of magnitude performance improvement over previously-known systems. Aspects include untraceable return addresses, group chat, feed-following and large payloads. Transaction protocols include a variety of payments use cases.
    Type: Application
    Filed: March 14, 2016
    Publication date: May 17, 2018
    Inventor: DAVID Chaum
  • Publication number: 20170200338
    Abstract: A method allows a random sample of a large population of voters to cast votes and for both the unpredictability/un-manipulability of the sample selection and the integrity of the tally to be verified by any interested parties using public information. The problem of vote selling is addressed. Also, a variant allows voters to remain substantially anonymous.
    Type: Application
    Filed: January 13, 2017
    Publication date: July 13, 2017
    Inventor: David CHAUM
  • Publication number: 20150277123
    Abstract: A near-to-eye display system includes a source of modulated light, a proximal optic positionable adjacent an eye of the user to receive the modulated light. The proximal optic has a plurality of groups of optically redirecting regions. The optically redirecting regions are configured to direct a plurality of beams of the modulated light into a pupil of the eye to form a contiguous illuminated portion of the retina of the eye. A first group of the optically redirecting regions receives modulated light from the source and redirect beams of the modulated light into the pupil of the eye for illumination of a first portion of the retina. A second group of the optically redirecting regions receives modulated light from the source and redirect beams of the modulated light into the pupil of the eye for illumination of a second portion of the retina.
    Type: Application
    Filed: February 3, 2015
    Publication date: October 1, 2015
    Inventors: David CHAUM, Thomas W. Mossberg, John R. Rogers
  • Publication number: 20140172517
    Abstract: A novel method allows a random sample of a large population of voters to cast votes and for both the unpredictability/un-manipulability of the sample selection and the integrity of the tally to be verified by any interested parties using public information. The problem of vote selling is addressed. Also, a variant allows voters to remain substantially anonymous.
    Type: Application
    Filed: June 18, 2012
    Publication date: June 19, 2014
    Inventor: David Chaum
  • Publication number: 20120132713
    Abstract: A paper ballot voting system is described that allows voters to verify that their ballots are correctly counted and provide substantiating evidence if they are not. The systems work whether or not automation is available in the polling place. In other aspects special pens and printing provide protection of voter privacy and against marks being added after ballots are cast. Further aspects of the approach include robust ballot scanning and improved transparency of the voter check-in process.
    Type: Application
    Filed: February 7, 2012
    Publication date: May 31, 2012
    Inventor: David CHAUM
  • Patent number: 8162215
    Abstract: A paper-ballot voting system is disclosed in which voters can retain symbols printed adjacent to the particular candidates or ballot question positions that they mark. Including ballot serial numbers on the forms allows voters to check online the symbols recorded for their ballots while maintaining ballot secrecy. In case of dispute, a physical resolution procedure lets voters establish whether the recorded symbols are correct with respect to the actual physical ballots. Some examples allow forms to be obtained online and voted by physical or facsimile delivery. Voters who cannot read ballots or cannot mark ballots can nevertheless vote while maintaining ballot secrecy. The overall integrity of the outcome is provided transparently.
    Type: Grant
    Filed: July 15, 2008
    Date of Patent: April 24, 2012
    Inventor: David Chaum
  • Patent number: 8123114
    Abstract: An improved paper ballot voting system allows voters to verify that their ballots are correctly counted and provide substantiating evidence if they are not. Codes are revealed to voters by the act of marking the ballot during voting and voters can check that these codes are posted. If these codes are not posted as marked, voters can make the codes they obtained public. These codes made public by voters can be compared against codes that were cryptographically committed to in advance of the election. If the codes from voters do in fact match codes committed to, evidence of incorrectness of the vote tallying is provided.
    Type: Grant
    Filed: April 14, 2009
    Date of Patent: February 28, 2012
    Inventor: David Chaum
  • Publication number: 20100149073
    Abstract: A near-to-eye display system for forming an image as an illuminated region on a retina of at least one eye of a user is disclosed. The system includes a source of modulated light, a proximal optic positionable adjacent an eye of the user to receive the modulated light. The proximal optic has a plurality of groups of optically redirecting regions. The optically redirecting regions are configured to direct a plurality of beams of the modulated light into a pupil of the eye to form a contiguous illuminated portion of the retina of the eye. A first group of the optically redirecting regions is configured to receive modulated light from the source and redirect beams of the modulated light into the pupil of the eye for illumination of a first portion of the retina. A second group of the optically redirecting regions is configured to receive modulated light from the source and redirect beams of the modulated light into the pupil of the eye for illumination of a second portion of the retina.
    Type: Application
    Filed: October 14, 2009
    Publication date: June 17, 2010
    Inventors: David Chaum, Thomas W. Mossberg, John R. Rogers
  • Publication number: 20100110368
    Abstract: The present invention relates to a personal multimedia electronic device, and more particularly to a head-worn device such as an eyeglass frame having a plurality of interactive electrical/optical components. In one embodiment, a personal multimedia electronic device includes an eyeglass frame having a side arm and an optic frame; an output device for delivering an output to the wearer; an input device for obtaining an input; and a processor comprising a set of programming instructions for controlling the input device and the output device. The output device is supported by the eyeglass frame and is selected from the group consisting of a speaker, a bone conduction transmitter, an image projector, and a tactile actuator. The input device is supported by the eyeglass frame and is selected from the group consisting of an audio sensor, a tactile sensor, a bone conduction sensor, an image sensor, a body sensor, an environmental sensor, a global positioning system receiver, and an eye tracker.
    Type: Application
    Filed: October 7, 2009
    Publication date: May 6, 2010
    Inventor: David Chaum
  • Publication number: 20100061553
    Abstract: Disclosed are systems and methods for providing video content while inhibiting the copying of that content for later viewing. Video images may be made difficult to copy for presentation at later times by the omission or addition of content developed in relation to the particular initial viewing. For instance, video information may be customized by omitting information that is not likely to be substantially perceived by the initial viewer but that is substantially likely to be perceived as missing by at least some other viewers.
    Type: Application
    Filed: April 25, 2008
    Publication date: March 11, 2010
    Inventor: David Chaum
  • Publication number: 20090308922
    Abstract: A paper ballot voting system is described that allows voters to verify that their ballots are correctly counted and provide substantiating evidence if they are not. The systems work whether or not automation is available in the polling place. In other aspects special pens and printing provide protection of voter privacy and against marks being added after ballots are cast. Further aspects of the approach include robust ballot scanning and improved transparency of the voter check-in process.
    Type: Application
    Filed: April 14, 2009
    Publication date: December 17, 2009
    Inventor: David Chaum
  • Patent number: 7516891
    Abstract: Disclosed are voting systems based on paper ballots that provide integrity of the election outcome through the novel use of encrypted votes and other techniques. In some example embodiments, holes through layers allow voters to see and mark symbols on lower layers, carbonless coatings allow voters to obtain substantially identical marks on facing surfaces, self-adhesive stickers are removed from one position and placed by voters hiding vote-revealing indicia on a second position, and scratch-off layers bearing vote-revealing indicia are destroyed while being removed to expose coded information. Simplified cryptography for realizing these systems is also presented. Related systems allow those with various disabilities to develop and check voted ballot forms that are substantially indistinguishable from those voted by other voters. Inclusion of write-in votes is provided for. Also provided are inclusion of provisional ballots and spoilt ballots and integration with registration sign-in.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: April 14, 2009
    Inventor: David Chaum
  • Publication number: 20080272194
    Abstract: A paper-ballot voting system is disclosed in which voters can retain symbols printed adjacent to the particular candidates or ballot question positions that they mark. Including ballot serial numbers on the forms allows voters to check online the symbols recorded for their ballots while maintaining ballot secrecy. In case of dispute, a physical resolution procedure lets voters establish whether the recorded symbols are correct with respect to the actual physical ballots. Some examples allow forms to be obtained online and voted by physical or facsimile delivery. Voters who cannot read ballots or cannot mark ballots can nevertheless vote while maintaining ballot secrecy. The overall integrity of the outcome is provided transparently.
    Type: Application
    Filed: July 15, 2008
    Publication date: November 6, 2008
    Inventor: David Chaum
  • Publication number: 20070095909
    Abstract: Disclosed are voting systems based on paper ballots that provide integrity of the election outcome through the novel use of encrypted votes and other techniques. In some example embodiments, holes through layers allow voters to see and mark symbols on lower layers, carbonless coatings allow voters to obtain substantially identical marks on facing surfaces, self-adhesive stickers are removed from one position and placed by voters hiding vote-revealing indicia on a second position, and scratch-off layers bearing vote-revealing indicia are destroyed while being removed to expose coded information. Simplified cryptography for realizing these systems is also presented. Related systems allow those with various disabilities to develop and check voted ballot forms that are substantially indistinguishable from those voted by other voters. Inclusion of write-in votes is provided for. Also provided are inclusion of provisional ballots and spoilt ballots and integration with registration sign-in.
    Type: Application
    Filed: September 11, 2006
    Publication date: May 3, 2007
    Inventor: David Chaum
  • Patent number: 7210617
    Abstract: An election system provides, in one example, each voter with multiple physical “layers” that the voter is able to choose between. The voter takes part of the layers as a kind of receipt and the other layers are retained and/or destroyed by the system. The actual vote is not readily revealed by the layers taken by the voter, thus protecting against improper influence. In the voting booth, when all the layers are combined, however, the voter is readily able to verify the vote. Moreover, posted images of the layers not taken by the voter can be used to compute the election results in a way that is verifiable by interested parties. The results cannot be changed without substantial probability of detection and privacy of votes can be maintained unless a number of parties are compromised or collude.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: May 1, 2007
    Inventor: David Chaum
  • Publication number: 20060218636
    Abstract: Solutions to the so-called “man in the middle” problem are disclosed. One example uses a mutually-random value that is the same for each of two communicants absent a man in the middle, but differs between the communicants in case a man-in-the-middle is present. Communicants become aware if their random values differ, for example, through stock content inserted into the communication stream, interactive games, or derived limitations on the channel. In other examples, opening of encrypted parts of the communication is delayed until certain other communication takes place and/or is imminent. In still further examples, a man in the middle becomes apparent because of increased latency of communication between the participants and the effect is optionally accentuated through mutually-random values that shift latency. Further aspects allow parties to apply authentication related to participants they have communicated with when they were convinced that no man in the middle was present.
    Type: Application
    Filed: March 24, 2006
    Publication date: September 28, 2006
    Inventor: David Chaum
  • Publication number: 20060191419
    Abstract: In one example embodiment, an article of manufacture includes a wooden element such as a dowel, preferably formed from toasted oak, that is attached to the inside of a screw-type wine vessel closure. In a second example embodiment, the wooden element is attached to a stopper. In yet other embodiments, elements are attached to the inside of a wine bottle or are prevented from leaving the bottle during pouring by deformable shape. In a wine making method, the wine is not aged in oak barrels but rather filled in bottles and sealed with the oak insert and aged in the bottles, including optional agitation, to accomplish substantially the functions of the barrel oak aging.
    Type: Application
    Filed: February 28, 2006
    Publication date: August 31, 2006
    Inventors: Edward Spoljaric, David Chaum
  • Patent number: 6718314
    Abstract: Disclosed is a multi-purpose transaction card system comprising an issuer, one or more cards, one or more terminals, and optionally one or more acquires, communicating using a variety of cryptographic confidentiality and authentication methods. Cards authenticate messages using public key based cryptographic without themselves performing the extensive computations usually associated with such cryptography. Integrity of complex transaction sequences and plural card storage updates are maintained even under intentionally generated interruptions and/or modifications of data transmitted between card and terminal. Cards do not reveal any information to the terminal which is not directly necessary for the transaction or any information to which the terminal should not have access, though externally measurable aspects of its behavior. Transaction types supported include those suitable for off-line credit cards, in which the “open to buy” is maintained on the card.
    Type: Grant
    Filed: August 12, 2002
    Date of Patent: April 6, 2004
    Assignee: Infospace, Inc.
    Inventors: David Chaum, Niels Ferguson, Jelte Van Der Hoek