# US 9,519,766 B1 · System and method of providing and validating enhanced CAPTCHAs > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,766 B1 - Document ID: US9519766B1 - Status: Granted - Kind: B1 - Application number: 14/846,923 - Filed: 2015-09-07 - Granted: 2016-12-13 - Earliest claimed: 2015-09-07 - Assignees: VoiceBox Technologies, Inc. - Applicants: Voicebox Technologies Corporation - Inventors: Vikrant Bhosale; Spencer John Rothwell; Ahmad Khamis Elshenawy - Web page: https://patentgrep.com/patent/US9519766B1 ## CPC - G06F 21/36: by graphic or iconic representation - G06F 21/31: User authentication - G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints - G06F 2221/2133: Verifying human interaction, e.g., Captcha - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract The invention relates to a system and method of automatically distinguishing between computers and human based on responses to enhanced Completely Automated Public Turing test to tell Computers and Humans Apart (“e-captcha”) challenges that do not merely challenge the user to recognize skewed or stylized text. A given e-captcha challenge may be specific to a particular knowledge domain. Accordingly, e-captchas may be used not only to distinguish between computers and humans, but also determine whether a respondent has demonstrated knowledge in the particular knowledge domain. For instance, participants in crowd-sourced tasks, in which unmanaged crowds are asked to perform tasks, may be screened using an e-captcha challenge. This not only validates that a participant is a human (and not a bot, for example, attempting to game the crowd-source task), but also screens the participant based on whether they can successfully respond to the e-captcha challenge. ## Claims ### Claim 1 A computer implemented method of distinguishing between computers and humans through enhanced completely automated public turing test to tell computers and humans apart (e-captcha), the method being implemented in a computer system having one or more physical processors programmed with computer program instructions that, when executed by the one or more physical processors, cause the computer system to perform the method, the method comprising: providing, by the computer system, via a network, executable instructions configured to generate a user interface that includes an e-captcha challenge, wherein the e-captcha challenge requires one or more words or phrases to be uttered; receiving, by the computer system, an audio input via at least one input configured to receive the audio input, the audio input comprising a response to the e-captcha challenge; using, by the computer system, an automated speech recognition engine to convert the audio input to text; determining, by the computer system, an edit distance between the one or more words or phrases to be uttered and the text converted from the audio input; determining, by the computer system, whether the one or more words or phrases to be uttered were at least partially correctly uttered based on the edit distance; responsive to a determination that the one or more words or phrases were at least partially correctly uttered, causing, by the computer system, information indicating that the response is valid to be provided; and responsive to a determination that the one or more words or phrases were not at least partially correctly uttered, causing, by the computer system, information indicating that the response is invalid to be provided. ### Claim 2 (depends on 1) The method of claim 1, wherein the e-captcha challenge comprises a math problem and the response comprises an attempted solution to the math problem. ### Claim 3 (depends on 1) The method of claim 1, wherein the e-captcha challenge comprises a question to be answered. ### Claim 4 (depends on 1) The method of claim 1, the method further comprising: receiving, by the computer system, a request to provide the e-captcha challenge, wherein the executable instructions are provided responsive to the request, and wherein the request comprises one or more parameters that specify an e-captcha challenge to be provided; and identifying, by the computer system, the e-captcha challenge based on the one or more parameters. ### Claim 5 (depends on 4) The method of claim 4, wherein the one or more parameters specify a subject matter of the e-captcha challenge to be provided. ### Claim 6 (depends on 4) The method of claim 4, wherein the one or more parameters further specify a level of difficulty of the e-captcha challenge. ### Claim 7 (depends on 4) The method of claim 4, wherein the one or more parameters further specify a time limit by which the response to the e-captcha challenge must be received. ### Claim 8 (depends on 1) The method of claim 1, the method further comprising: storing, by the computer system, an indication of whether the one or more words or phrases were at least partially correctly uttered in association with identifying information that identifies a user or an end user device associated with the response; and determining, by the computer system, a number of times that the user or the end user device associated with the response has failed or passed skill-based actions based on the stored indication, wherein the number of times indicates a proficiency of the user or the end user device at correctly completing e-captcha challenges. ### Claim 9 (depends on 1) The method of claim 1, wherein the e-captcha challenge further comprises a trivia question to be answered and wherein the response comprises an attempted answer to the trivia question. ### Claim 10 (depends on 1) The method of claim 1, wherein the e-captcha challenge further comprises an audio clip to be identified and wherein the response comprises an attempted identification of the audio clip. ### Claim 11 (depends on 1) The method of claim 1, wherein the e-captcha challenge further comprises a video clip to be identified and wherein the response comprises an attempted identification of the video clip. ### Claim 12 (depends on 1) The method of claim 1, wherein the e-captcha challenge further comprises an image to be identified and wherein the response comprises an attempted identification of the image. ### Claim 13 (depends on 1) The method of claim 1, wherein the e-captcha challenge further comprises a puzzle to be solved and wherein the response comprises an attempted solution to the puzzle. ### Claim 14 A system of distinguishing between computers and humans through enhanced completely automated public turing test to tell computers and humans apart (e-captcha), comprising: a computer system having a memory that stores computer program instructions and one or more physical processors programmed with the computer program instructions that, when executed by the memory and one or more physical processors, cause the computer system to: provide, via the network, executable instructions configured to generate a user interface that includes an e-captcha challenge, wherein the e-captcha challenge requires-one or more words or phrases to be uttered; receive an audio input via at least one input configured to receive the audio input, the audio input comprising a response to the e-captcha challenge; use an automated speech recognition engine to convert the audio input to text; determine an edit distance between the one or more words or phrases and the text converted from the audio input; determine whether the one or more words or phrases to be uttered were was at least partially correctly uttered based on the edit distance; responsive to a determination that the one or more words or phrases were at least partially correctly uttered, cause information indicating that the response is valid to be provided; and responsive to a determination that the one or more words or phrases were not at least partially correctly uttered, cause information indicating that the response is invalid to be provided. ### Claim 15 (depends on 14) The system of claim 14, wherein the e-captcha challenge comprises a math problem and the response comprises an attempted solution to the math problem. ### Claim 16 (depends on 14) The system of claim 14, wherein the e-captcha challenge comprises a question to be answered. ### Claim 17 (depends on 14) The system of claim 14, wherein the computer system is further programmed to: receive a request to provide the e-captcha challenge, wherein the executable instructions are provided responsive to the request, and wherein the request comprises one or more parameters that specify an e-captcha challenge to be provided; and identify the e-captcha challenge based on the one or more parameters. ### Claim 18 (depends on 17) The system of claim 17, wherein the one or more parameters specify a subject matter of the e-captcha challenge. ### Claim 19 (depends on 17) The system of claim 17, wherein the one or more parameters further specify a level of difficulty of the e-captcha challenge. ### Claim 20 (depends on 17) The system of claim 17, wherein the one or more parameters further specify a time limit by which the response to the e-captcha challenge must be received. ### Claim 21 (depends on 14) The system of claim 14, wherein the computer system is further programmed to: store an indication of whether the one or more words or phrases were at least partially correctly uttered in association with identifying information that identifies a user or an end user device associated with the response; and determine a number of times that the user or the end user device associated with the response has failed or passed skill-based actions based on the stored indication, wherein the number of times indicates a proficiency of the user or the end user device at correctly completing e-captcha challenges. ### Claim 22 (depends on 14) The system of claim 14, wherein the e-captcha challenge further comprises a trivia question to be answered and wherein the response comprises an attempted answer to the trivia question. ### Claim 23 (depends on 14) The system of claim 14, wherein the e-captcha challenge further comprises an audio clip to be identified and wherein the response comprises an attempted identification of the audio clip. ### Claim 24 (depends on 14) The system of claim 14, wherein the e-captcha challenge further comprises a video clip to be identified and wherein the response comprises an attempted identification of the video clip. ### Claim 25 (depends on 14) The system of claim 14, wherein the e-captcha challenge further comprises an image to be identified and wherein the response comprises an attempted identification of the image. ### Claim 26 (depends on 14) The system of claim 14, wherein the e-captcha challenge further comprises a puzzle to be solved and wherein the response comprises an attempted solution to the puzzle.