CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart.

This is a very good example of a basic CAPTCHA in Scratch.

Customizable with difficulty until 100 and a maximum of a 10 digit number.

The example shown in the project is difficulty 30 and 6 digits. You can change it accordingly using the “generate captcha” custom block.

The reason this is a “very good” example of CAPTCHA in Scratch is because it uses SHA256 to hash the captcha, so you cannot see inside to cheat! Huge huge thanks to @Nick_2440 for remaking the SHA256 algorithm in scratch — https://scratch.mit.edu/projects/238080220/

- Uses Pen, so you don't need to worry about the clone limit

- Two sprites, one for the main captcha and the other for the SHA256 algorithm made by @Nick_2440

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Do you want to use this in your projects? Follow the steps here!

1) Backpack the “CAPTCHA” sprite and the “SHA-256” sprite
2) Place both of them in your project
3) Use the block “broadcast ‘runCaptcha’ and wait” to generate, show and validate the CAPTCHA!

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Post any suggestions / feedback over here!

Very cool!

bump

Awesome!

Vaibhs11 wrote:

scrapcha is a cool name for it

ok

slgsan-encrypted wrote:

by taking advantage of slow variables

Your reasoning is wrong. The reason is because the hashing takes a lot of time.

slgsan-encrypted wrote:

variables take a long time to change

Proof?

epic

Vaibhs11 wrote:

scrapcha is a cool name for it
but awesome project

HEY I KNoW yOU

cool

Approved

bruh i swear i will use this name WHATSOEVERRRRRRR (I had come up with the name earlier today and when I searched it it CAME UP WITH THIS and I was livid xD btw the name was sCrAPTCHA spelt like that to highlight the CAPTCHA letters)

e

What is a captcha? : for those who dont know