Masquerade attacks are characterized by an adversary stealing a legitimate user’s credentials and using them to impersonate the victim and perform malicious activities, such as stealing information. Prior work on masquerade attack detection has focused on profiling legitimate user behavior and detecting abnormal behavior indicative of a masquerade attack. Like any anomaly-detection based techni...

Predation is a fundamental process in the interaction between species, and exerts strong selection pressure. Hence, anti-predatory traits have been intensively studied. Although it has long been speculated that individuals of some species gain protection from predators by sometimes almost-uncanny resemblances to uninteresting objects in the local environment (such as twigs or stones), demonstra...

Masquerade attacks pose a grave security problem that is a consequence of identity theft. Detecting masqueraders is very hard. Prior work has focused on profiling legitimate user behavior and detecting deviations from that normal behavior that could potentially signal an ongoing masquerade attack. Such approaches suffer from high false positive rates. Other work investigated the use of trap-bas...

Large blood-stained pleural effusions, especially in young patients, are unusual and may be caused by metastatic disease in the chest, a large pulmonary infarction, and, rarely, pulmonary tuberculosis. Meigs' syndrome is an uncommon cause of pleural effusion associated with ascites and a benign ovarian tumour, most often a fibroma. The fluid is usually clear but occasionally blood-stained. The ...