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PPT : A Mechanism for Establishing Electronic Commerce Policies
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* Contracts may be annulled for various reasons
o For example: the travel agency is bankrupt.
* Contracts may be revised
o For example: the travel agency establishes a new certifying authority which issues certificates for sale representatives;
* Contracts may be stateful:
o Examples of stateful contract provisions:
+ Only a limited number of tickets, say 100, may be purchased at the discounted price.
+ FlyAway accepts reservations. A PO for a reserved ticket is honored only if made within 24 hours from the reservation.
* Need to support a large set of autonomous, evolving and stateful contracts.
* Current access control mechanisms deal mostly with monolithic, relatively stable, stateless policies.
Traditional Approaches
* Have a dedicated server for each contract:
o Problematic, if the number of contracts is large
* Combine all contracts in a super policy:
o The super policy is difficult to construct if the number of contracts is large;
o The super policy needs to change every time a new contract is established, or a contract ends;
o The super policy needs to change when a contract is anulled or revised.
* Motivation
* Certificates
* Certified policies
* The enforcement mechanism
* Conclusion
A Necessary Parenthesis: Certificates
* Are used to prove certain attributes regarding the owner:
o Ex: the owner is John Doe, and he is employed by TravelRus, and he is a travel agent;
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Category : Travel AgentsSource : dimacs.rutgers.edu
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