He completed his Ph.D. studies at the computer science laboratory of École Normale Supérieure, and defended it in 1995 at the Paris Diderot University; his advisor was Jacques Stern.
In 1999, he moved to a professorship at the École Polytechnique Fédérale de Lausanne where he leads the Laboratory of Security and Cryptography (LASEC).
The system would thus allow a third party to trace the movements of a phone using the application by means of Bluetooth sensors scattered along its path, for example in a building.
[10] In 1997 he introduced decorrelation theory, a system for designing block ciphers to be provably secure against many cryptanalytic attacks.
[11] Vaudenay was appointed program chair of Eurocrypt 2006,[12] PKC 2005,[13] FSE 1998;[14] and in 2006 elected as board member of the International Association for Cryptologic Research.