Arithmetic, geometry, cryptography, and coding theory 2009 : 12th Conference on Arithmetic, Geometry, Cryptography and Coding Theory, March 30 - April 3, 2009, Marseille, France ; Geocrypt Conference, April 27 - May 1, 2009, Point-à-Pitre, Guadelope, France ; European Science Foundation Exploratory Workshop Curves, Coding Theory, and Cryptography, March 25 - 29, 2009, Marseille, France (2010)