Smartcards are trusted personal devices designed to store and process confidential data, and to act as secure tokens for providing access to applications and services. Smartcards ...
A new reversible watermarking algorithm based on the difference expansion of colored images has been developed. Since the watermark is completely reversible, the original image ca...
. 5dpo is a team created in 1998 in the Faculty of Engineering of the University of Porto in Portugal. The team regularly participates in RoboCup middle-size and small size leagues...
Paulo Costa, Armando Sousa, Paulo Marques, Pedro C...
Sensor networks are often used to sense the physical world and provide observations for various uses. In hostile environments, it is critical to control the network access to ensur...
Increasingly pervasive networks are leading towards a world where data is constantly in motion. In such a world, conventional techniques for query processing, which were developed...