4. 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.
6. The method of claim 4 , wherein the one or more parameters further specify a level of difficulty of the e-captcha challenge.