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strongswan setup for ipsec environment
Machine certificates can be distributed over an insecure channel. What it is necessary to distribute via a secure channel is the Certification Authority's certificate. In your case, with only two machines, the advantage of public-key crypto is really very minor. With more machines, using public-key crypto reduces the amount of keys that you have to distribute.
Pen test cell-phones
Newer SIM cards should have anti-tamper protection that makes it useless if you try to clone it. Have you already succeeded in cloning one?
What is the risk of a packet being sniffed when travelling over the internet without SSL/TLS?
The job of SSL/TLS is also to authenticate the server.