Internet security incidents have shown that while network cryptography tools like SSL are valuable to Internet service, the hard problem is to protect the server itself from attack. The host security problem is important because attackers know to attack the weakest link, which is vulnerable servers. The problem is hard because securing a server requires securing every piece of software on the server that the attacker can access, which can be a very large set of software for a sophisticated server. Sophisticated security architectures that protect against this class of problem exist, but because they are either complex, expensive, or incompatible with existing application software, most Internet server operators have not chosen to use them.
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