maybe it is a fool question, but I have read some texts and don't found a convince answer.

About cipher-suite, ECDHE-RSA-AES128-GCM-SHA256, I'm in doubt of what is the role of RSA in the first part (ECDHE-RSA), this part of cipher suite tells the key exchange algorithm right?

  That is why ECDHE is used for, key exchange, so why we need RSA?

We use both algorithms to exchange the keys?

I'm a bit confused about that.

OBS: Is not necessary to explain ECDHE or RSA separately.

Thanks.

I have read some textbooks and not found a convincing explanation.

In the cipher suite ECDHE-RSA-AES128-GCM-SHA256, what is the role of RSA in the first part (ECDHE-RSA)? This part of the cipher suite indicates the key exchange algorithm, right? That is what ECDHE is used for: key exchange, so why do we need RSA?

Are both algorithms used to exchange the keys? I’m a bit confused about that.

Obviously, it is not necessary to explain ECDHE or RSA separately. I just want an explanation of how they work in this context.