Vulnerable systems: a Trend Vulnerability: a weakness that can be exploited to cause damage Attack: a method to exploit a The Internet vulnerability World-Wide connection Distributed: no central design and control Open infrastructures: modems. wireless, DHCP Untrusted software: applets, downloads Unsophisticated users homogeneit · Security costs Hardware: x86 Market now, fix bugs later OS: Windows Customers want it applications but won't pay for it7 Vulnerable Systems: a Trend • The Internet – World-Wide connection – Distributed: no central design and control – Open infrastructures: modems, wireless, DHCP – Untrusted software: applets, downloads – Unsophisticated users • Security costs – Market now, fix bugs later – Customers want it, but won’t pay for it • Homogeneity – Hardware: x86 – OS: Windows – Applications: Vulnerability: a weakness that can be exploited to cause damage Attack : a method to exploit a vulnerability