feat: RSA cryptosystem signature project

[vkWeb]

This is a simple implementation of RSA cryptosystem. The only caveat is that the implementation doesn't work with prime numbers greater than 10 like 11, 19. I have asked a question on StackOverflow to deal with this.

@scissorsneedfoodtoo This is my first JavaScript project. So, I'll be looking forward to your feedback. I would love to see ways of improving the current implementation and project design. 😃

Closes #101

[vkWeb]

@scissorsneedfoodtoo Actually, I realized just now, there's a small flaw in the implementation that might be the reason for prime > 10 issue. I'll fix it soon.

[vkWeb]

@scissorsneedfoodtoo All issues fixed. Now, we are ready to break it down into units.

[vkWeb]

@scissorsneedfoodtoo I would love to see your feedback on the test descriptions written so far. How can I make it better?

[scissorsneedfoodtoo]

@vkWeb, sure, let me take a look and make some suggestions.

[vkWeb]

@scissorsneedfoodtoo I think you should look at test descriptions to simplify challenges a bit more. I'll appreciate your feedback on ways of improving the teaching approach.

And tell me from your perspective whether campers will be able to grasp the concepts through these tests or not. This project should be a hit one ;)

[vkWeb]

@scissorsneedfoodtoo Do we need to break index.html and style.css into test descriptions? If yes then maybe we should turn this into a console based application to reduce unnecessary UI hassle.

[scissorsneedfoodtoo]

@vkWeb, yes, we're pushing for learners to write much if not all of the code for these projects. Turning this project into a console based application is a good idea and would help learners focus on learning about RSA signatures.

[vkWeb]

@scissorsneedfoodtoo I have turned this into a console based application. The test descriptions are almost complete. I just need to revise some of them and add a bit more to illustrate hash collision.

Please provide your feedback so that I can further improve them.

[vkWeb]

@scissorsneedfoodtoo Here's the diagram to illustrate the signing process:

☝️ How does this look? Do you feel campers will comfortably understand the process through this diagram?

[scissorsneedfoodtoo]

@vkWeb, your diagram looks great! Makes it much easier to understand the whole process. The only suggestion I have is to alter the text slightly:

Encrypt hash value --> Encrypt the hash value using Alice's private key
Decrypt the signature --> Decrypt the signature using Alice's public key

Would you mind if I merge this as is? Any changes can be made in a future PR.

[vkWeb]

@scissorsneedfoodtoo I think now the descriptions look good. I have made some adjustments to the diagram on your advice.

Also, I have added some descriptions to illustrate the hash collision. Now, we only need to explain the internals of the encryption and decryption equation.

@scissorsneedfoodtoo Yes, we can merge this if you think everything looks fine. Maybe we can explain the equations in a future PR.

@scissorsneedfoodtoo, @QuincyLarson what do you think about the current state of this project? Your feedback will help me in improving this project.

[scissorsneedfoodtoo]

@vkWeb, thank you for updating your diagram. It's much easier to reason about now that the keys are in there. I just noticed a couple of things:

• Encrypt hash value using Alice's private key --> Encrypt the hash value using Alice's private key
• If the hash value and decrypted signature match then the signature is authentic and the message must be from Alice only --> If the hash value and decrypted signature match, then the signature is authentic and the message can only be from Alice / If the hash value and decrypted signature match, then the signature is authentic and the message must be from Alice

I think your project is definitely headed in the right direction. A few of the later lessons still need some editing, so I'll leave comments here and they can be handled in a future PR. Other than that, I'll keep trying to learn more about how those equations so hopefully we can explain them simply and thoroughly.

[vkWeb]

@scissorsneedfoodtoo Thanks for merging brother! 🎉

Yes, we'll keep on improving the project in future PR(s). Btw please re-open the issue #101 and move it to Coding Project Tests in the kanban board.