from ars technica: It can sometimes be forgotten that computer viruses are not a Windows-only problem, but the recent announcement that RFID chips may be vulnerable to viral attack underscores the threat that malicious code can pose to all types of systems. A group of researchers at Vrije Universiteit in Amsterdam have just presented a paper (PDF) at the Pervasive Computing and Communications Conference in Pisa, Italy that demonstrates just how such a virus might work.