CAPTCHA techniques utilizing traceable images

A system comprising:

• one or more processors;
• a memory coupled to the one or more processors, the memory encoded with a set of instructions which when executed by the one or more processors causes the one or more processors to perform a process comprising:
• selecting a first image element from a set of image elements, the first image element having a first representation of a single stroke;
• selecting a second image element from the set of image elements, the second image element having a second representation of another single stroke;
• creating, by a first computing device, a traceable image by combining the first image element with the second image element, wherein combining the first image element with the second image element includes aligning the first representation of the single stroke in the first image element with the second representation of the other single stroke in the second image element at an edge of each image element;
• sending, by the first computing device, data representing the traceable image to be displayed by a second computing device;
• receiving input data corresponding to a trace of the displayed traceable image made at the second computing device;
• determining, based upon the received input data, whether the trace of the displayed traceable image is within an error tolerance range of the set of coordinates associated with the traceable image;
• and
• sending a result of the determination.

A non-transitory computer-readable storage memory storing a plurality of instructions executable by one or more processors, the plurality of instructions comprising instructions that cause the one or more processors to perform a process comprising:

• selecting a first image element from a set of image elements, the first image element having a first representation of a single stroke;
• selecting a second image element from the set of image elements, the second image element having a second representation of another single stroke;
• creating, by a first computing device, a traceable image by combining the first image element with the second image element, wherein combining the first image element with the second image element includes aligning the first representation of the single stroke in the first image element with the second representation of the other single stroke in the second image element at an edge of each image element;
• sending, by the first computing device, data representing the traceable image to be displayed by a second computing device;
• receiving input data corresponding to a trace of the displayed traceable image made at the second computing device;
• determining, based upon the received input data, whether the trace of the displayed traceable image is within an error tolerance range of the set of coordinates associated with the traceable image;
• and
• sending a result of the determination.