Introduction Here in this article I am discussing that how can you use the HMAC Algorithm of cryptography to check the integrity and authenticity of code. If you want to check the message authenticity you have to give the message and also a secret key as we used key 'Hello' in this article. Then you click on the Authenticate button and you will get the Authenticated message with different algorithms of HMAC. The Implementation of this needs seven TextBox and one Button control. Getting Started