In this chapter, we learned about the different characteristics and types of CAPTCHA. Artificial Intelligence can be used to crack CAPTCHA, wherein we see how a CAPTCHA image can be converted into a deciphered image. We also saw how cyber criminals break CAPTCHAs for ATO purposes.

We also learned about the theory on CNN, which is a class of deep FFNN, most commonly applied to analyzing visual imagery.

In the next chapter, we will learn about using data science to catch email frauds and spam.