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Instant messaging (IM) is increasingly popular among not only Internet but also smartphone users. In this paper, we analyze the security issue of an IM application, KakaoTalk, which is the most widely used in South Korea, with a focus on automated friends registration based on contacts sync. We demonstrate that there are multiple ways of collecting victims'(More)
Prion proteins can adopt self-propagating alternative conformations that account for the infectious nature of transmissible spongiform encephalopathies (TSEs) and the epigenetic inheritance of certain traits in yeast. Recent evidence suggests a similar propagation of misfolded proteins in the spreading of pathology of neurodegenerative diseases including(More)
Available online xxx Keywords: Finding friends with phone numbers Enumeration attack Information leakage Privacy Instant messaging KakaoTalk a b s t r a c t Users' phone numbers are popularly used for finding friends in instant messaging (IM) services. In this paper, we present a new security concern about this search feature through a case study with(More)
The infectious agent of prion diseases is believed to be nucleic acid-free particles composed of misfolded conformational isomers of a host protein known as prion protein (PrP). Although this "protein-only" concept is generally accepted, decades of extensive research have not been able to elucidate the mechanisms by which PrP misfolding leads to(More)
Many people started being concerned about their privacy in delivering private chats, photographs, contacts and other personal information through mobile instant messaging services. Fortunately, in the majority of mobile instant messaging services, encrypted communication channels (e.g., using the SSL/TLS protocols) are used by default to protect delivered(More)
Prions are known to be formed by β-sheet-rich amyloid fibrils. Their detailed structural architecture, however, is still obscure due to the failure of biophysical structure analysis on insoluble, non-crystalline and heterogeneous protein fibrils, not amenable to X-ray crystallography and liquid-state NMR. Since all model concepts available to date are based(More)
The balance between tissue-type plasminogen activator (t-PA) and plasminogen activator inhibitor type 1 (PAI-1) regulates fibrinolysis. PAI-1 expression increases in atherosclerotic arteries and vascular smooth muscle cells (VSMCs) are one of major constituents of atheroma. We investigated the impact of lysophosphatidylcholine (lysoPC), an active component(More)
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