Africa crypt is an Annual International Conference on the Theory and Applications of Cryptology. Africacrypt 2011 is organized by the LACGAA team (Laboratoire d’Algèbre, de Cryptologie, de Géométrie Algébrique et Applications) of the “Université Cheikh Anta Diop de Dakar” (UCAD) in cooperation with the International Association for Cryptologic Research (IACR). The aim of Africacrypt 2011, that will take place in Dakar (Senegal) on July 5-7, 2011, is to provide an international forum for practitioners and researchers from industry, academia and government from all over the world for a wide ranging discussion of all forms of cryptography and its applications.