On my website I display an image. To generate this image, it require a string parameters. For example the string
1234,2423,1231 as the parameter.
Anyone can use my API (no authentication required). For example
example.com/generate?param=1234,2423,1231. That is how my API works right now. To generate a different image, all you have to do is provide different numbers and different amount of numbers, like
However, I do not want people to be able to keep generating images by themselves by simply changing the numbers. So if I encrpyt the parameter and then let the user load the image, they would never know how to generate an image themselves. So an example of an encrypted API request would be
example.com/generate?param=s97dgfubYVd80fzhgdfufg0894rf which would correspond to
The add on to this problem is, I tell the user "we are going to generate an image with the parameters
1234,2423,1231. Here is the API link to generate this image:
So what encryption method can I use.