When inserting (pasting) a public SSH key on a user’s folder, within a Droplet, Im seeing a lot of people urge to

chmod 700 ~/.ssh

and then to

chmod 600 ~/.ssh/authorized_keys

But if i *chmod 600 ~/.ssh/authorized_keys* with my user then i am not able to login via ssh, i need to change it to *chmod 755 ~/.ssh/authorized_keys* in order to connect.

Which leads to my question: Why is so important to have a public key under chmod 600??

And why im not being able to connect with chmod 600 but only with chmod 755?

Thanks in advanced