An increasing number of corporate security policies make it desirable to push security closer to the desktop. It is not practical or feasible to place security and monitoring software on all computing devices (e.g. printers, personal digital assistants, copy machines, legacy hardware). We have begun to prototype a hardware and software architecture that will enforce security policies by pushing security functions closer to the end user, whether in the office or home, without interfering with users' desktop environments. We are developing a specialized programmable Ethernet network switch to achieve this. Embodied in this device is the ability to detect and mitigate network attacks that would otherwise disable or compromise the end user's computing nodes. We call this device a 'Secure Programmable Switch' (SPS). The SPS is designed with the ability to be securely reprogrammed in real time to counter rapidly evolving threats such as fast moving worms, etc. This ability to remotely update the functionality of the SPS protection device is cryptographically protected from subversion. With this concept, the user cannot turn off or fail to update virus scanning and personal firewall filtering in the SPS device as he/she could if implemented on the end host. The SPS concept alsomore » provides protection to simple/dumb devices such as printers, scanners, legacy hardware, etc. This report also describes the development of a cryptographically protected processor and its internal architecture in which the SPS device is implemented. This processor executes code correctly even if an adversary holds the processor. The processor guarantees both the integrity and the confidentiality of the code: the adversary cannot determine the sequence of instructions, nor can the adversary change the instruction sequence in a goal-oriented way.« less