Neal H. Walfield

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The GNU Hurd's design was motivated by a desire to rectify a number of observed shortcomings in Unix. Foremost among these is that many policies that limit users exist simply as remnants of the design of the system's mechanisms and their implementation. To increase extensibility and integration, the Hurd adopts an object-based architecture and defines(More)
We present a storage management framework for Web 2.0 services that places users back in control of their data. Current Web services complicate data management due to data lock-in and lack usable protection mechanisms, which makes cross-service sharing risky. Our framework allows multiple Web services shared access to a single copy of data that resides on a(More)
This paper provides insights into human mobility by analyzing cell tower traces. Cell tower trace data is an attractive method for studying mobility as the data can be collected in an energy-efficient and privacy-preserving way. Our new data set is useful for confirming or determining fundamental mobility parameters and for understanding mobile networks. In(More)
Commodity operating systems fail to meet the security , resource management and integration expectations of users. We propose a unified solution based on a capability framework as it supports fine grained objects, straightforward access propagation and virtualizable interfaces and explore how to improve resource use via access decomposition and policy(More)
We present the design and implementation of a trust-on-first-use (TOFU) policy for OpenPGP. When an OpenPGP user verifies a signature, TOFU checks that the signer used the same key as in the past. If not, this is a strong indicator that a key is a forgery and either the message is also a forgery or an active man-in-the-middle attack (MitM) is or was(More)
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