While mobile handheld devices, such as cell phones and PDAs, provide productivity benefits, they also pose new risks. A vital safeguard against unauthorized access to a device’s...
Abstract. Recently, Shen et al. proposed an improvement on YangShieh’s timestamp-based password authentication scheme using smart cards. Then they claimed that their scheme canno...
We propose a new cryptographic technique, Acknowledgment Compression, permitting senders of multicast data to verify that all interested parties have either received the data or l...
Abstract. The realisation of electronic commerce process is very difficult without appropriate system for electronic payment. Of course it is possible to use some of the convention...
Communications devices intended for use in securitycritical applications must be rigorously evaluated to ensure they preserve data confidentiality. This process includes tracing t...