Descripción: Universidade de Lisboa. Departamento de Informática «Most of my recent research has been in the area of intrusion tolerance. The objective here is to provide support for the construction of systems that perform as expected even in the presence of accidental faults and/or intrusions perpetrated by malicious attackers. Together with some colleagues, we have been studying the concept of wormholes, which are enhanced subsystems that offer a few simple privileged functions and channels to other components, with "good" properties otherwise not guaranteed by the "normal" weak environment.»