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The Next Talk Fa'14 Talks General Info Speaking Req't

Declassification and Authorization in Epistemic Logic

Friday, October 3rd, 2014 from 12-1 pm in GHC 4303.

Arbob Ahmad, CSD

Noninterference (NI) defines a program to be secure if changes to high-security inputs cannot alter low-security outputs. NI indirectly states the epistemic property that the low-security outputs do not include knowledge obtained from the high-security inputs. However, NI is too restrictive a property to incorporate declassification of some high-security inputs and not others. By reasoning about declassification in epistemic logic, we express what knowledge is obtained through the execution of a program by the declassifications. Therefore, as a consequence of the adequacy of the epistemic logic for modeling the program behavior, we can still derive some NI-like properties for those high inputs that have not been declassified. Moreover, the epistemic logic we choose can also express authorization policies for when a declassification may occur. When knowledge reasoning is combined with authorization in a single logic, we can derive properties of knowledge flows such as the lemma that the derivation that knowledge is declassified must include the proof that the declassification is authorized. In this talk, I will present our formulation of declassification and authorization and outline how we prove interesting epistemic properties of programs that go beyond NI.

Joint work with Robert Harper

In partial fulfillment of the Speaking Requirement


Fall 2014 Schedule
Tue, Sep 2 GHC 6501 AVAILABLE
Fri, Sep 5 GHC 4303 AVAILABLE
Tue, Sep 9 GHC 6501 AVAILABLE
Fri, Sep 12 GHC 4303 AVAILABLE
Tue, Sep 16 GHC 6501 AVAILABLE
Fri, Sep 19 GHC 4303 AVAILABLE
Tue, Sep 23 GHC 6501 AVAILABLE
Fri, Sep 26 GHC 4303 AVAILABLE
Tue, Sep 30 GHC 6501 AVAILABLE
Fri, Oct 3 GHC 4303 Arbob Ahmad Declassification and Authorization in Epistemic Logic
Tue, Oct 7 GHC 6501 AVAILABLE
Fri, Oct 10 GHC 4303 AVAILABLE
Tue, Oct 14 GHC 6501 AVAILABLE
Fri, Oct 17 GHC 4303 AVAILABLE
Tue, Oct 21 GHC 6501 AVAILABLE
Fri, Oct 24 GHC 4303 AVAILABLE
Tue, Oct 28 GHC 6501 AVAILABLE
Fri, Oct 31 GHC 4303 AVAILABLE
Tue, Nov 4 GHC 6501 Sarah Loos Formal Verification of Distributed Aircraft Controllers
Fri, Nov 7 GHC 4303 AVAILABLE
Tue, Nov 11 GHC 6501 AVAILABLE
Fri, Nov 14 GHC 4303 AVAILABLE
Tue, Nov 18 GHC 6501 AVAILABLE
Fri, Nov 21 GHC 4303 AVAILABLE
Tue, Nov 25 GHC 6501 AVAILABLE
Fri, Nov 28 GHC 4303 Thanksgiving Break UNAVAILABLE
Tue, Dec 2 GHC 6501 AVAILABLE
Fri, Dec 5 GHC 4303 AVAILABLE
Tue, Dec 9 GHC 6501 AVAILABLE
Fri, Dec 12 GHC 4303 AVAILABLE
Tue, Dec 16 GHC 6501 AVAILABLE


General Info

The Student Seminar Series is an informal research seminar by and for SCS graduate students from noon to 1 pm on Tuesdays and Fridays. Lunch is provided by the Computer Science Department (personal thanks to Sharon Burks and Debbie Cavlovich!). At each meeting, a different student speaker will give an informal, 40-minute talk about his/her research, followed by questions/suggestions/brainstorming. We try to attract people with a diverse set of interests, and encourage speakers to present at a very general, accessible level.

So why are we doing this and why take part? In the best case scenario, this will lead to some interesting cross-disciplinary work among people in different fields and people may get some new ideas about their research. In the worst case scenario, a few people will practice their public speaking and the rest get together for a free lunch.


Guideline & Speaking Requirement Need-to-Know

Note: Step #1 below are applicable to all SSS speakers. You can schedule AT MOST THREE talks per semester.

SSS is an ideal forum for SCS students to give presentations that count toward fulfilling their speaking requirements. The specifics, though, vary with each department. For instance, students in CSD will need to be familiar with the notes in Section 8 of the Ph.D. document and follow the instructions outlined on the Speakers Club homepage. Roughly speaking, these are the steps:

  1. Schedule a talk with SSS by sending your talk title, abstract, additional info (like "Joint work with..." or "In Partial Fulfillment of the Speaking Requirement"), and a picture of yourself (preferably jpeg) to sss@cs at least TWO WEEKS before your scheduled talk.
  2. After you are confirmed with your SSS slot, go to the Speakers Club Calendar and schedule your talk at least THREE WEEKS in advance of the talk date.
  3. On the day of your talk, make sure you print Speakers Club evaluation forms for your evaluators to use.
Students outside of CSD will need to check with their respective departments regarding the procedure. As another example, ISRI students fulfill their speaking requirements by attending a semesterly Software Research Seminar and giving X number of presentations per school year. If you have experience with your department that might help others in your department, please feel free to contribute your knowledge by emailing us. Thank you!


SSS Coordinators

Armaghan Naik, Computational Biology
Lin Xiao, CSD

 


Web contact: sss+www@cs