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2003. Randomized instruction set emulation to disrupt binary code injection attacks. In Proceedings of the 10th ACM Conference on Computer and Communications Security, Washington, DC. 272– 280. BEST, R. M. 1979. S. Patent no. 4 168 396. BEST, R. M. 1980. Preventing software piracy with crypto-microprocessors. In Proceedings of the IEEE Spring COMPCON ’80, San Francisco, CA. 466–469. , AND SEKAR, R. 2003. Address obfuscation: An approach to combat buffer overflows, format-string attacks and more.

2003], although this is unimplemented in the current prototype. Such a randomization would make it difficult for the attacker to guess its location correctly. An alternative, although much more expensive, solution would be to monitor all writes and disallow modifications from client code and certain emulator areas. It is worth noting that this form of attack (targeting emulator data structures) would require executing several commands without executing a single machine language instruction. Although such attacks are theoretically possible via chained system calls with correct arguments, and simple (local) attacks have been shown to work [Nergal 2001], these are not a common technique [Wilander and Kamkar 2003].

However, our scheme also differs from the scheme in [Eschenauer and Gligor 2002]. In [Eschenauer and Gligor 2002], the same key may be shared by multiple sensor nodes. In contrast, in our scheme, there is a unique key for each pair of sensor nodes. If no more than t shares on the same polynomial are disclosed, none of the pairwise keys constructed using this polynomial between two noncompromised sensor nodes will be disclosed. Now let us describe this scheme by instantiating the three components in the general framework.

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ACM transactions on information and systems security (February) by D. R. Kuhn on corporate internet, B. Bertino on authorization constraints, V. Bhamidipati and others M. Nyanchama and S. Osborn on the role graph model, Ravi Sandhu


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