Service Central de la Sécurité des Systèmes d'Information
The translatin from French to English isn't hard, but I'll do it for you: Central Service for Information Systems Security
SCSSI is the French governmental organisation responsible for the regulation cryptosystems and their use.
In February 1996 SCSSI replaced DISSI - Délégation Interministérielle pour la Sécurité des Systèmes d'Information - (The Interministerial Office for Information Systems Security Service).
If you speak French, or can use Babelfish, then it may interest you to know that the SCSSI website is at http://www.scssi.gouv.fr/
SCSSI is not to be confused with SCSI (Small Computer System Interface).