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A large number of embedded devices on the internet, such as routers and VOIP phones, are typically ripe for exploitation. Little to no defensive technology, such as AV scanners or IDS's, are available to protect these devices. The authors propose a host-based defense mechanism, which they call Symbiotic Embedded Machines (SEM), that is specifically designed to inject intrusion detection functionality into the firmware of the device. A SEM or simply the Symbiote, may be injected into deployed legacy embedded systems with no disruption to the operation of the device. A Symbiote is a code structure embedded in situ into the firmware of an embedded system.
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