The 11th conference on Arithmetic, Geometry, Cryptography and Coding The-
ory (AGC2T 11) was held in Marseilles at the “Centre International de Rencontres
Math´ ematiques” (CIRM), during November 5-9, 2007. This international confer-
ence has been a major event in the area of applied arithmetic geometry for more
than 20 years and included distinguished guests J.-P. Serre (Fields medal, Abel
prize winner), G. Frey, H. Stichtenoth and other leading researchers in the ﬁeld
among its 77 participants.
The meeting was organized by the team “Arithm´ etique et Th´ eorie de l’Information”
(ATI) from the “Institut de Math´ ematiques de Luminy” (IML). The program con-
sisted of 15 invited talks and 18 communications. Among them, thirteen were
selected to form the present proceedings. Twelve are original research articles cov-
ering asymptotic properties of global ﬁelds, arithmetic properties of curves and
higher dimensional varieties, and applications to codes and cryptography. The ﬁ-
nal article is a special lecture of J.-P. Serre entitled “How to use ﬁnite ﬁelds for
problems concerning inﬁnite ﬁelds”.
The conference fulﬁlled its role of bringing together young researchers and spe-
cialists. During the conference, we were also happy to celebrate the retirement of
our colleague Robert Rolland with a special day of talks.
Finally, we thank the organization commitee of CIRM for their help during the
conference and the Calanques for its inspiring atmosphere.