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While originating as an instant messaging infrastructure, the eXtensible Messaging and Presence Protocol (XMPP) has its applications as a lightweight middleware for real-time event distribution, e.g. for mobile computing or the Internet of Things. Services based on XMPP are traditionally realized as server components with simple local registration for discovery, which is not appropriate for distributed...
Directory services are used by almost every enterprise computing environment to provide data concerning users, computers, contacts, and other objects. Virtual directories are components that provide directory services in a highly customized manner. Unfortunately, though the use of virtual directory services are widespread, an analysis of risks posed by their unique position and architecture has not...
Tokens are popular in two factor authentication, where the first authentication credential is a fixed secret key s1 associated with the user and the second authentication credential is a dynamic secret key s2 generated by the token assigned to the user. Popular hardware tokens use a synchronized clock T along with a static secret key encoded into the token to generate a one time secret s2. The contribution...
Paper-based folders have been widely used to coordinate cares in medical-social networks, but they introduce some burning issues (e.g. privacy protection, remote access to the folder). Replacing the paper-based folder system by a traditional Electronic Healthcare Record (EHR) introduces new drawbacks: forcing of the patient consent, unbounded data retention, no security guarantee outside the server...
One-time password (OTP) is always used as the strongest authentication scheme among all password-based solutions. Currently, consumer devices such as smart card have implemented OTP based two-factor authentications for secure access controls. Such solutions are economically sound without support of timestamp mechanisms. Therefore, synchronization of internal parameters in OTP models, such as moving...
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