Fareed Zaffar

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This paper investigates two seller-driven black-hat online marketplaces, SEOClerks and MyCheapJobs, aiming to shed light on the services they offer as well as sellers and customers they attract. We perform a measurement-based analysis based on complete crawls of their websites and find that the vast majority of services target popular social media and(More)
Previous distributed anomaly detection efforts have operated on summary statistics gathered from each node. This has the advantage that the audit trail is limited in size since event sets can be succinctly represented. While this minimizes the bandwidth consumed and helps scale the detection to a large number of nodes, it limits the infrastructure's ability(More)
Identifying when anomalous activity is correlated in a distributed system is useful for a range of applications from intrusion detection to tracking quality of service. The more specific the logs, the more precise the analysis they allow. However, collecting detailed logs from across a distributed system can deluge the network fabric. We present an(More)
The Paranoid file system is an encrypted, secure, global file system with user managed access control. The system provides efficient peer-to-peer application transparent file sharing. This paper presents the design, implementation and evaluation of the Paranoid file system and its access-control architecture. The system lets users grant safe, selective,(More)
—Large data processing tasks can be effected using workflow management systems. When either the input data or the programs in the pipeline are modified, the workflow must be re-executed to ensure that the final output data is updated to reflect the changes. Since such re-computation can consume substantial resources, optimizing the system to avoid redundant(More)
With the advent of big data, modern businesses face an increasing need to store and process large volumes of sensitive customer information on the cloud. In these environments, resources are shared across a multitude of mutually untrusting tenants increasing propensity for data leakage. This problem stands to grow further in severity with increasing use of(More)
Having timely and credible security information is becoming critical to network and security management. Most current sources of threat information and detection techniques suffer from having a limited view of the global threat scenario. In this paper, we present Foresight, an internet scale threat analysis, indication, early warning and response(More)
Over 9 million new active tuberculosis (TB) cases emerge each year from an enormous pool of 2 billion individuals latently infected with Mycobacterium tuberculosis (M. tb.) worldwide. About 3 million new TB cases per year are unaccounted for, and 1.5 million die. TB, however, is generally curable if diagnosed correctly and in a timely manner. The current(More)