Claude Castelluccia Gabriel Montenegro Julien Laganier Christoph Neumann Hindering Eavesdropping via IPv6 Opportunistic Encryption. 309-321 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3193&spage=309 2004 conf/esorics/2004 ESORICS db/conf/esorics/esorics2004.html#CastellucciaMLN04