HeidiSQL and Plink.exe

I have created a session with Putty to connect the server via SSH using RSA key. If I use this command I can log in to the server with Plink.exe using RSA authentication:

plink -load mysession

And then I open HeidiSQL using SSH tunnel and it connects fine.

1. Doing things that way can I make sure I'm using the secure SSH connection with keys authentication and not sending any plain text with login and password?

2. Is it possible to achieve the same thing using plink inside HeidiSQL without running plink command line before?

I would appreciate any help.

Not sure but you could try the ppk file which you can pass in HeidiSQL's SSH tunnel settings.