Generating Adversarial Examples
In Layman’s terms, Adversarial Examples mean the inputs created with the sole intention of confusing a neural network. These inputs improve the performance of the model, as it is exposed to CAPTCHAs that are hard to solve. We need to follow a few steps to generate adversarial examples:
- Choosing the Target Model
- Selection of Dataset
- Defining the Objective function
- Generation of Adversarial
So, according to the steps, a target model is chosen, and we select the dataset the model was originally trained on. Then the objective function identifies how different the output is from the real output. This helps the process of adversarial creation. Afterward, we can use numerous techniques to generate adversarial. These include Jacobian Based Saliency Map(JBSM), Fast Gradient Sign Method(FGSM), and many more. After the creation of adversarial, your model is ready to be improved. Again TensorFlow can be used to create these adversarial examples, and you can create them quite easily.
How to Break a CAPTCHA System with Machine Learning?
CAPTCHA, short for Completely Automated Public Turing Test to Tell Computers and Humans Apart, is a revolutionary technology that helps identify humans from bots and saves your site from malicious intentions. But this technology has begun to show its age. Captcha was supposed to be a robust system, but artificial intelligence is driving it almost useless. To break a Captcha, we require a machine-learning model which we need to train. After its training, all that is required is to feed the model any CAPTCHA you want, which it will solve for you.
Through this article, we will explore how one can break a CAPTCHA system with the help of machine learning. We will discuss in detail the complete process. Besides, we will also share the limitations of this approach and the ethical and moral issues that need to be considered while attempting this. This should be remembered that our intention behind breaking CAPTCHA should be to educate ourselves and highlight the incapability of the system to filter out non-humans. But CAPTCHAs are the things saving sites from malicious attacks, and they are effectively safeguarding the internet. So, using bots to break CAPTCHAs on websites without permission is unethical at best and also illegal, depending on your location.
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