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SUMMARY:Talking to strangers - Bruce Christianson\, University of Hertford
 shire
DTSTART:20081202T161500Z
DTEND:20081202T171500Z
UID:TALK14901@talks.cam.ac.uk
CONTACT:Andrew Lewis
DESCRIPTION:Access Control is conventionally built on top of authenticatio
 n. This approach is problematic when several different security policy dom
 ains are involved. Authenticating across domain boundaries requires conten
 ding with different policies (and mechanisms) for identity management\, de
 legation and revocation of authorization\, etc. Additional issues in perva
 sive computing include the lack of transitive infrastructure and the promi
 scuity of casual device interactions.\n\nThis talk will describe an approa
 ch to localizing the trust assumptions required for multi-domain access co
 ntrol in a pervasive environment. We place dual capabilities inside Identi
 ty-Based Encryption wrappers to force the authentication problems back ins
 ide each player's 'home' domain.\n\nSecurity problems which arise from tal
 king to the wrong strangers are usually addressed by attempting to ensure 
 that we know to whom we are speaking. We argue that often it is preferable
  to know that we are talking to the correct stranger.
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Building
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