In order not to lose data, copies should be kept in lots of locations. That makes it difficult to really delete the data, since the backup copies can be stolen or copied. The obvious solution is to encrypt the data, and then discard the keys of data that is to be destroyed. However, reliably keeping, then reliably destroying all copies of deleted keys has the same problem. This talk describes a system that supports three types of assured delete; expiration time known at file creation, on-demand deletion of individual files, and custom keys for classes of data. It is easy and inexpensive to manage and involves only trivial performance overhead over a traditional encrypted file system.
Dr. Radia Perlman is a Sun Fellow at Sun Microsystems, working on network and security protocols. She invented many of the basic algorithms that make today's network infrastructure robust and scalable. Her current research interests include assured delete, making large networks robust against Byzantine failures, and replacing bridges/switch with technology which is upwardly compatible, but more robust, flexible, and scalable. She is author of "Interconnections: Bridges, Routers, Switches, and Internetworking Protocols", and coauthor of "Network Security: Private Communication in a Public World", which are widely used both as textbooks in universities and for engineers to learn the field. She holds over 90 patents, a PhD in computer science from MIT, and an honorary doctorate from KTH, the Royal Institute of Technology, Sweden. She recently was given a lifetime achievement award by Usenix, and named SVIPLA (Silicon Valley Intellectual Property Law Association) Inventor of the year.