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The software puzzle scheme counters resource-inflated Denial-of-Service (DoS) attacks by requiring each client connecting to the server to correctly solve a cryptographic puzzle before a connection can be established. It is specifically designed to thwart attempts at utilizing high-performance Graphic Processing Units (GPUs) to cut down solution time, by dynamically and randomly generating the puzzle...
Denial-of-service (DoS) and distributed DoS (DDoS) are among the major threats to cyber-security, and client puzzle, which demands a client to perform computationally expensive operations before being granted services from a server, is a well-known countermeasure to them. However, an attacker can inflate its capability of DoS/DDoS attacks with fast puzzle-solving software and/or built-in graphics...
Metadata in a parallel distributed database contains information about table fragmentation, physical storage distribution, and access control policies. It is essential to query processing and security policy enforcement. Metadata in a parallel distributed database is usually stored in the form of system tables, it can be replicated through out every site in the system in order to improve performance...
Unlike most of the spams targeting for advertisements only, phishing spams try to cheat the email recipients with bogus sender addresses so as to obtain confidential information of the recipients. This paper presents a Sender Authentication Protocol (SAP) which aims to filter out this kind of crafty spoofing emails. To this end, SAP challenges the claimed-sender with the historical emails so as to...
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