298 results about "CAPTCHA" patented technology

An audible based electronic challenge system is used to control access to a computing resource by using a test to identify an origin of a voice. The test is based on analyzing a spoken utterance using optimized challenge items selected for their discrimination capability to determine if it was articulated by an unauthorized human or a text to speech (TTS) system.

A multi-party security protocol that incorporates biometric-based authentication and withstands attacks against any single party (e.g., mobile phone, cloud, or the user). The protocol involves the function split between mobile and cloud and the mechanisms to chain-hold the secrets. A key generation mechanisms binds secrets to a specific device or URL (uniform resource locator) by adding salt to a master credential. An inline CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) handling mechanism uses the same sensor modality as the authentication process, which not only improves the usability, but also facilitates the authentication process. This architecture further enhances existing overall system security (e.g., handling untrusted or compromised cloud service, phone being lost, impersonation, etc.) and also improves the usability by automatically handling the CAPTCHA.

A method and system to authenticate human interactive proof (HIP) are described here. In response to a request from a web server, a motion random HIP in the form of motion-captcha is generated. The web server can then display the generated the motion random HIP in a requested web page. The web page is accompanied with a request from the user to provide the response for the generated motion captcha. After evaluation and verification of response received from the particular user, the authentication system determine whether the response to the HIP challenge is from human or from other source like computer software scripted agent.

An improved system and method using a streaming captcha for online verification is provided. A request sent by a client device may be received by a server to serve a streaming captcha to the client device. A server may compose a streaming captcha by superimposing a captcha character string on a video. The streaming captcha may be streamed to the client device. The streaming captcha may be displayed on the client device, and a character string input by a user may be received in response to display of the streaming captcha. The character string received may be sent to the server for verification. The server may verify that the character string received is the same as the captcha character string displayed in the streaming captcha. The server may then send an indication of the verification to the client device.

A method of using advertisements in a Completely Automatic Public Turing test to tell Computers and Humans Apart (CAPTCHA) challenge/response transaction. In accordance with one aspect, a server allows access to some resource if the response to the ad/CAPTCHA challenge is an acceptable response.

Systems and processes for performing user verification using an imaged-based CAPTCHA are disclosed. The verification process can include receiving a request from a user to access restricted content. In response to the request, a plurality of images may be presented to the user. A challenge question or command that identifies one or more of the displayed plurality of images may also be presented to a user. A selection of one or more of the plurality images may then be received from the user. The user's selection may be reviewed to determine the accuracy of the selection with respect to the challenge question or command. If the user correctly identifies a threshold number of images, then the user may be authenticated and allowed to access the restricted content. However, if the user does not correctly identify the threshold number of images, then the user may be denied access the restricted content.

Embodiments of the present invention relate to a method of providing an automated public Turing test to a client display system. The method includes providing an image having a plurality of random characters, as well as providing a browser code to the client, whereby the browser code is adapted to restrict display of the image to only a predetermined portion of the image. The method further includes detecting a client response to receiving the predetermined portion of said image.

The present disclosure relates to a Completely Automated Public Turing Test to tell Computers and Humans Apart (CAPTCHA) image authentication method and system. The CAPTCHA image authentication method comprises the steps of: collecting a plurality of first objects; defining a plurality of variables so as to be used as basis for classifying and dividing the plural first objects into M groups accordingly while allowing each group in the M groups to correspond to at least one variable selected from the plural variables; selecting at least one group from the M groups while further grading and dividing the first objects in the selected group into subgroups of N grades based upon a standard unit of the variable corresponding to the selected group; sorting and storing the subgroups of N grades; and selecting a plurality of authentication objects from the subgroups of N grades to be used in an authentication process.

A system for displaying a set of selectable CAPTCHAs produces a first set of CAPTCHAs whose images are based at least partially on an alphanumeric sequence, where a respective CAPTCHA in the first set is associated with a CAPTCHA property. The system also produces a second set of CAPTCHAs whose images are based at least partially on an alphanumeric sequence, where a respective CAPTCHA in the second set is not associated with a CAPTCHA property. Next, the system displays the first and second sets of CAPTCHAs. Finally, the system makes respective CAPTCHAs in the first and second sets of CAPTCHAs selectable, thereby allowing a user to pass a CAPTCHA challenge by distinguishing the first set of CAPTCHAs from the second set of CAPTCHAs without typing the words associated with the images.

A method for determining if a user of a computer system is a human. A processor receives an indication that a computer security program is needed and acquires at least one image depicting a first string of characters including at least a first and second set of one or more characters. A processor assigns a substitute character to be used as input for each of the second set of one or more characters. A processor presents the at least one image and an indication of the substitute character and when to use the substitute character to the user. A processor receives a second string of characters from the user. A processor determines whether the second string of characters substantially matches the first string of characters based on the substitute character assigned to each of the second set of one or more characters and determines whether the user is a human.

In a system and method for the generation of attack-resistant, user-friendly, image-based CAPTCHAs (Completely Automated Public test to Tell Computers and Humans Apart), controlled distortions are applied to randomly chosen images and presented to a user for annotation from a given list of words. An image is presented that contains multiple connected but independent images with the borders between them distorted or otherwise visually obfuscated in a way that a computer cannot distinguish the borders and a user selects near the center of one of the images The distortions are performed in a way that satisfies the incongruous requirements of low perceptual degradation and high resistance to attack by content-based image retrieval systems. Word choices are carefully generated to avoid ambiguity as well as to avoid attacks based on the choices themselves.

An arrangement for authenticating a transaction between a user's mobile device and an entity such as a corporate server is disclosed. The user's universal integrated circuit card (UICC) is adapted to generate a time-dependent authentication code which is dependent on a time value and which is usable to authenticate the transaction only during a predetermined period. A time verification processor verifies a time value to ensure that the time-dependent authentication code was generated based on the correct time value. The time value is based on the UTC time obtained from UTC clock. The verified time is used to generate a “one-time” password (authentication code) by the authentication code calculator of the UICC. This is used to authenticate a transaction with the corporate network.

An improved system and method for providing and using captchas for online advertising is provided. An advertisement may be received, embedded in a captcha and stored for use in online advertising. A question about the advertisement may also be stored along with a valid answer for use in verifying a user has received an impression of the advertisement. In response to a request received for sending a captcha with an embedded advertisement to a web browser operating on a client, a captcha with an embedded advertisement may be selected and sent to the web browser for display as part of a web page. Upon verifying the response to the question from the user is a valid answer, receipt of an impression of the advertisement may be recorded. Additionally, the awareness of an online advertisement may be measured for a target audience and reported to advertisers.

Disclosed is a system and method for generating a universally usable, completely automated public turing test to tell a computer and a human apart (CAPTCHA). The universally usable CAPTCHA uses contextually related pictures and sounds to present concepts to a user. The pictures allow the CAPTCHA to be used by someone who could see, and the audio would allow the CAPTCHA to be used by someone who could not see. This combination of sound and images should make the CAPTCHA more universally usable for a larger population of users than previously known CAPTCHAs.

An improved system and method for providing and using captchas for online advertising is provided. An advertisement may be received, embedded in a captcha and stored for use in online advertising. A question about the advertisement may also be stored along with a valid answer for use in verifying a user has received an impression of the advertisement. In response to a request received for sending a captcha with an embedded advertisement to a web browser operating on a client, a captcha with an embedded advertisement may be selected and sent to the web browser for display as part of a web page. Upon verifying the response to the question from the user is a valid answer, receipt of an impression of the advertisement may be recorded. Additionally, the awareness of an online advertisement may be measured for a target audience and reported to advertisers.

Digital watermarks are embedded in image data (102)in order to enable authentication of the image data and/or replacement of rejected portions of the image data. Authentication codes are derived by comparing selected discrete cosine transform (DCT) (104) coefficients within DCT data (106) derived from the original, spatial-domain image data. The authentication codes thus generated are embedded in DCT coefficients (612) other than the ones which were used to derive the authentication codes. The resulting, watermarked data can be sent or made available to one or more recipients who can compress or otherwise use the watermarked data. Image data derived from the watermarked data—e.g, compressed versions of the watermarked data—can be authenticated by: extracting the embedded authentication codes, comparing DCT coefficients derived from the coefficients from which the original authentication codes were generated; and determining whether the compared DCT coefficients are consistent with the extracted authentication codes.

The present disclosure involves a method. The method includes receiving a request from a user. The method includes constructing, by a computer processor, a media object that contains a plurality of media components. The method includes transmitting the media object to the user. The method includes prompting the user to perform a task involving at least a subset of the media components, the task including at least one of the following: selecting each of the media components in the subset according to a predefined sequence; and modifying at least one of the media components in the subset with respect to at least one of its following properties: location, size, appearance, and orientation. The method includes obtaining a description of an action performed by the user in response to the prompting. The method includes deciding whether or not to grant the request based on the obtaining.

A system and method configured that may allow performing a human-computer verification including crediting a verified task from a first user to a second user. In additional embodiments, may allow the user to perform a computer operation that require human-computer verification based upon an amount of credits that the user has been provided.

A delivery of content to the unspecified number of persons is prevented by limiting the content delivery range. A delivery source terminal 110 generates an authentication code based on the number of possible transmission times of content and an authentication code key 116, and configures the number of possible transmission times and the generated authentication code in a packet. The delivery source terminal 110 transmits the packet to a delivery destination terminal 130. A router 120 verifies whether the authentication code generated based on the number of possible transmission times and the authentication code key 124 that are received agrees with the authentication code received from the delivery source terminal 110, updates the number of possible transmission times when the two codes agree, generates a new authentication code, and configures it in the packet. The router 120 transmits the packet thus generated to the delivery destination terminal 130.