13th Workshop on Elliptic Curve Cryptography (ECC 2009)

ECC 2009 is the 13th in a series of annual workshops dedicated to the study of elliptic curve cryptography and related areas. Over the past years the ECC conference series has broadened its scope beyond elliptic curve cryptography and now covers a wide range of areas within modern cryptography. For instance, past ECC conferences included presentations on hyperelliptic curve cryptography, pairing-based cryptography, side-channel attacks, voting protocols, quantum key distribution, AES, hash functions, and implementation issues.

This year the Workshop was hosted by The University of Calgary, August 24-26, 2009 at Calgary, Alberta, Canada.

I stayed at Travelodge (located in Motel Village, near the University of Calgary) 2227 Banff Trail NW.

I also participated to the Elliptic Curve Cryptography Summer School that was held the week before the ECC 2009 Workshop. The summer school ran from August 19 until August 22.

The scholarship committee offereed me  my accommodations for the duration of both events and the registration fees. The travel expences were coverd by the University of Oldenburg.

I have been to almost all EC Workshops since 2004 till this one.

North German Algebraic Geometry Seminar, Winter Term 2009/2010

The North German Algebraic Geometry Seminar is a joint seminar of the Algebraic Geometry groups in Bremen, FU Berlin, HU Berlin, Hamburg, Hannover, Göttingen, Groningen and Oldenburg

I attended North German Algebraic Geometry Seminar (NoGAGS), Winter Term 2009/2010  at Freie Universität Berlin, 19.11.-20.11.2009

During the event I stayed at Harnack-Haus and shared a room with my colleague Arne Grenzebach.

The organisers covered our expenses (travel, stay and registration fees).

Talk to Groningen on isogenous hyperelliptic curves of genus 2

Talk to Groningen, 13-11-2009 11:45-12:45

Marios Magioladitis,

The discrete logarithm problem on isogenous

hyperelliptic curves of genus 2

Abstract. In 2005, Jao, Miller, and Venkatesan proved that the DLP of elliptic curves with the same endomorhism ring is random reducible under the GRH. In this talk, we discuss a possible generalization of this result to hyperelliptic curves of genus 2 (and 3) defined over a finite field and show the difficulties involved. First, we explain the role of the endomorphism rings of the Jacobian and the polarization. Following the work of Jao, Miller and Venkatesan, we construct isogeny graphs for genus 2 curves. Specifically, we discuss the connection between isogenies and ideal classes in the Jacobian of these curves. This project is research in progress and we describe the current status of this research.