How to make 2 linux machines accept each other ssh connections without asking for a password

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http://serverfault.com – I need to create a cron script that will scp all the logs from one machine to a log parsing machine but when I scp I am requested to insert a password. Usually, when I connect to the servers using Putty, i'm using pageant and Putty to allow agent forwarding and when I choose the machine I want to connect to, it opens a putty window and gets me straight to the shell without the need to insert a password. This happens after I insert my rsa public key to the .ssh/authorized_keys file on each machine. I'd like to do the same but between two servers. Edit: I don't know why it was voted down... i (HowTos)