Download Bootstrapping Trust in Modern Computers by Bryan Parno PDF

By Bryan Parno

Trusting a working laptop or computer for a security-sensitive job (such as checking e-mail or banking on-line) calls for the consumer to grasp anything concerning the computer's nation. We research learn on securely shooting a computer's nation, and examine the application of this knowledge either for bettering safeguard at the neighborhood machine (e.g., to persuade the person that her laptop isn't contaminated with malware) and for speaking a distant computer's country (e.g., to let the person to ascertain that an internet server will accurately safeguard her data). even supposing the new "Trusted Computing" initiative has drawn either confident and damaging cognizance to this zone, we give some thought to the older and broader subject of bootstrapping belief in a working laptop or computer. We hide concerns starting from the huge choice of safe which may function a starting place for belief, to the usability matters that come up while attempting to express computing device country info to people. This method unifies disparate study efforts and highlights possibilities for added paintings which can advisor real-world advancements in laptop security.

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This verification process involves efficient hash function computations, so it is more efficient than performing a public-key based certificate verification for every measurement. Coker et al. [45] discuss five principles that should guide the development of attestation-based systems. In particular, they highlight the importance of freshness and the need for comprehensive information about the attestor. The latter creates tension with the attestor’s need to limit the amount of information it discloses.

Binding Data In contrast to sealing, encryption using a public binding key need not take place on the TPM. This allows for greater efficiency and flexibility when performing data encryption, but it means that the resulting ciphertext does not include a record of the entity that originally invoked the bind operation. , a cryptographic challenge such as a nonce) using a binding key, and hence learn something about the software state of the platform that performed the unbind operation. Employing NVRAM The TPM also includes a limited amount of nonvolatile RAM (NVRAM) that can be used to perform a function similar to sealed storage.

For ˆ When the example, suppose an attacker replaces the OS with a malicious OS (O). application is executed, the value of PCR5 will be: ˆ hˆ = H(H(H(H(0||B)||L )||O)||A ) The properties of the hash function H guarantee that with extremely high probability hˆ = h, and thus if an attacker invokes Unseal, the TPM will refuse to decrypt C. 4 Can We Use Platform Information Remotely? Section 2 described mechanisms for accumulating measurements of software state. In this section, we treat the issue of conveying these measurement chains to an external entity in an authentic manner.

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