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I'm looking for a most possible, secure solution to transfer data using rsync over Internet between 2 linux server.
I have 3 option: SSH, IPSEC and Kerberos.
Which one in your opinion should be most secure solution?
In my opinion IPsec is the most secure protocol over SSL and Kerberos and does not have to be hard to install. It often gets a bad rap because it does have the better security and hence more options as more secure algorithms are implemented.
Kerberos doesn't provide any amount of security for data transfer. It's merely an authentication and authorization system. SSH and IPSec are based on the same encryption algorithms and thus (in general) offer the same level of security. IPSec is more complicated, requires kernel-level support, and has issues traversing some cheaper routers.