Ecole Normale Supérieure
Département d'Informatique
45, rue d'Ulm
75230 Paris Cedex 05
Paris
ENS is in the center of Paris.
In order to come there :
DI/ENS is at the 45 rue d'Ulm.
The Crypto Team is in 'Aile Rataud':
Once you are at the gate of 45 rue d'Ulm, you face the main building.