SCP File Transfer

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http://www.unix.com – I have 3 AIX server namely - Server 1 , Server 2 and Server 3. And have done SCP setup between Server 1 and Server 2 so that i dont have to give password when i transfer file from Server 1 to Server 2 by setting public key between the server. Q1. If the unix password of the target server changes...do I need to do the public key setup again between the server1 and server 2. Q2. If I want to do simiar setup between server 2 and server 3. Do i need to re-genearate a difference public key between server 2 and server 3. (HowTos)