Conference keys are secret keys used by a group of users commonly and with which they can encipher (or decipher) messages such that communications are secure. Based on the Diffie ...
In 1990, Boyar, Chaum, Damg˚ard and Pedersen introduced convertible undeniable signatures which limit the self-authenticating property of digital signatures but can be converted b...
Ring signatures, introduced by Rivest, Shamir and Tauman, enable a user to sign a message anonymously on behalf of a “ring”. A ring is a group of users, which includes the sign...
Implementing support for group awareness is an essential and challenging process in groupware development. This paper reports our research on developing a Transparent Adaptation (...
LIMBS is an open source brokerage system developed in the framework of the CALIBRATE project. LIMBS relies on open standards and open contents to promote exchanges of learning res...