Secure inter networking?

Something I often wonder about: What will be involved to provide fundamentally secure inter networking?

It's generally accepted that TCP/IP was not designed with security in the forefront. However, considering the increasing amounts of commerce occuring on the Internet, it's ostrich-like to assume current secure networking methods will scale well or eventually become ubiquitous.

I suppose IPsec will help. But without pre-registering end-to-end security, is there a way that a client or server can expect it?

The typical vulnerabilities seem to reside in a few key areas:

• Proxy-based (man in the middle)
• Denial of Service (distributed or otherwise)
• Phishing (impersonation)
• Injection leading to loss of control (trojans, worms, poison packets and pages, botnets, etc.)

Will TCP/IP ultimately have to be re-designed or replaced to address these vulnerabilities? That seems unlikely at best.

Thoughts?