How can we Decrypt query parameter?

Hi,

You can use middleware for a decrypt your parameter before the controller call and it's just one function call so in my point of view this is the best and easiest way,

But make sure to use the same algorithm for decrypting as you used for encrypting.

So create one middleware helper and make a function for a decrypt and after that call this middleware from startup.cs file (under configure).

You can refer to my blog. 

https://rajeshgami93.blogspot.com/2022/07/encrypt-encrypt-payloadparameter-using.html 

Or you can refer to this blog also:

https://www.c-sharpcorner.com/article/asp-net-core-middleware/