Generation of enc_password parameter used for password encryption during authorization or account registration.
This endpoint is intended for the browser version of api.
How to find parameters for the request body?
You can find them in the source code of the page or by following the link - https://i.instagram.com/data/shared_data/.

We are interested in this part of the code

“encryption”:{“key_id”:“87”,“public_key”:“8dd9aad29d9a614c338cff479f850d3ec57c525c33b3f702ab65e9e057fc087e”,“version”:“9”}

This is where you get the data you need