We live in a world where our personal data are both valuable and vulnerable to misappropriation through exploitation of security vulnerabilities in online services. For instance, Dropbox, a popular cloud storage tool, has certain security flaws that can be exploited to compromise a users data, one of which being that a user’s access pattern is unprotected. We have thus created an implementation...

GPS (Global Positioning System) has a variety of applications among which real-time tracking finds significance in day-to-day life. GPS tracking is defined as the measurement of object position and orientation in a given coordinate system using GPS data at different points of time. GPS data are collected from GPS receivers attached to the moving objects and these data are used for tracking obje...

The currently used standard Internet communication is restricted to use a single path between the endpoints in a communication session. In the January of 2013 the Multipath TCP technology was established by IETF in order to open the possibility of the multiple path usage. Performance measurements proof that MPTCP efficiently aggregates the paths’ throughput. The MPTCP technology works in the Tr...

We present Ring ORAM, a simple and low-latency ORAM construction that can be parameterized for either small or large client storage. Simply by tuning parameters, Ring ORAM matches or exceeds the performance of the best-known small and large client storage schemes and can achieve a constant factor online bandwidth overhead over insecure systems. We evaluate Ring ORAM in theory and in practice. O...

We study the performance of TCP-based media transport when combined with packet path diversity (PPD) in the Internet. We present a simple PPD-TCP transport scheme where the acknowledgments (ACKs) from the receiver are duplicated and sent across independent network paths. We also investigate a PPD-TCP scheme where in addition to path-diversified ACKs on the backward path, packet path diversity i...

As more files are stored on today’s computers, understanding file activity patterns becomes crucial for developing systems to either compress rarely used data, or store it on tertiary storage devices such as tapes and optical disks. In this paper we compare and contrast long-term file system activity between different types of computing environments. We examine three different Unix file system ...

In this work, we consider a large-scale distributed network of servers and a problem of content distribution across it. We propose a novel algorithm, called FastReplica, for an efficient and reliable replication of large files in the Internet environment. There are a few basic ideas exploited in FastReplica. In order to replicate a large file among n nodes (n is in the range of 10-30 nodes), th...