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lecture: On the design of a portable secure filesystem: the crypto bits

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In this presentation I will present the cryptographic aspects of a new
secure filesystem called SEF. The goals of this project is to create a
filesystem that is secure, robust and easy to understand. The goal of this presentation is two fold. One is to present cryptographic primitive that can be used to design secure filesystems as opposed to the current practice of laying encryption just below or above the filesystem. The second is to solicit feedback on the security of my design.