strange request pathes

Hi, 
First off all I could not find proper title for this question.

I am recording in DB all pathes when user visits page. 
Strange thing is somebody tryied following urls in my website:
1. www.mywebsite.com/root/.ssh/id_dsa
2. www.mywebsite.com/.ssh/id_dsa
3. www.mywebsite.com/root/.ssh/id_rsa

Anybody can tell me that what these type of queries mean?

Thanks in advance