[Busec] busec this week: Sharon Goldberg (Wed 10-11am)

Sharon Goldberg goldbe at cs.bu.edu
Tue Sep 9 13:39:08 EDT 2014

Sorry for the spam.  Tomorrow's seminar will take place in MCS137 at 111
Cummington St, Boston.

On Tue, Sep 9, 2014 at 1:37 PM, Sharon Goldberg <goldbe at cs.bu.edu> wrote:

> I'll be giving the first busec seminar of the semester, tomorrow, about my
> new surveillance law paper on Executive Order 12333.  The following Wed,
> our new busec postdoc, Foteini Baldimtsi, will be talking about
> transferable e-cash.  And the Wed after that, our own Leo Rezyin will
> speak.  As usual, lunch is after the seminar, and abstracts are below.
> Hope you can make it!
> Sharon
> BUsec Calendar:  http://www.bu.edu/cs/busec/
> BUsec Mailing list: http://cs-mailman.bu.edu/mailman/listinfo/busec
> The busec seminar gratefully acknowledges the support of BU's Center for
> Reliable Information Systems and Cyber Security (RISCS).
> ******
> Loopholes for Circumventing the Constitution: Unrestrained Bulk
> Surveillance on Americans by Collecting Network Traffic Abroad
> Speaker: Sharon Goldberg, BU.
> Wednesday September 10, 2014, 10:00-11am
> We reveal interdependent legal and technical loopholes that the U.S.
> intelligence community could use to circumvent constitutional and statutory
> safeguards for Americans. We describe how the collection of American's
> Internet traffic on foreign territory exploits loopholes that can leave
> Americans as unprotected as foreigners by current U.S. surveillance laws.
> We also describe how modern Internet protocols can be manipulated to
> deliberately divert American's traffic abroad, where it can then be
> collected under a more permissive legal regime (Executive Order 12333) that
> is overseen solely by the Executive branch of the U.S. government.  While
> the media has reported on some of the techniques we describe (eg operation
> 'MUSCULAR') we cannot establish the extent to which these loopholes are
> exploited in practice. Instead, we seek to contribute to public
> understanding of EO 12333 and its underlying policies, in particular how
> advances in technology implicate the privacy protections contained
> therein.
> Joint work with Axel Arnbak.
> Truly Anonymous Transferable E-Cash
> Speaker: Foteini Baldimtsi. BU
> Wednesday Sept 17, 2014  10-11am
> Hariri Seminar Room, MCS180
> Abstract:  Cryptographic e-cash allows off-line electronic transactions
> between a bank, users and merchants in a secure and anonymous fashion. A
> plethora of e-cash constructions has been proposed in the literature;
> however, these traditional e-cash schemes only allow coins to be
> transferred once between users and merchants. Ideally, we would like users
> to be able to transfer coins between each other multiple times before
> deposit, as happens with physical cash. “Transferable” e-cash schemes are
> the solution to this problem. Unfortunately, the currently proposed schemes
> are either not efficient at all, or do not achieve the desirable anonymity
> properties without compromises, such as the existence of a judge,
> responsible for persecuting double spenders, who can trace all coins and
> users in the system. This paper presents the first efficient and fully
> anonymous transferable e-cash scheme without a judge. We start by revising
> the security and anonymity properties of transferable e-cash to capture
> issues that were previously ignored. For our construction we use the
> recently proposed malleable signatures by Chase et al. to allow secure and
> anonymous transferring of the coins. Finally, we propose an independent,
> efficient double spending detection mechanism and discuss possible real
> world applications of our construction.
> Joint work with: Melissa Chase, Georg Fuchsbauer, Markulf Kohlweiss

Sharon Goldberg
Computer Science, Boston University
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