Orange

Julien Devigne

Sébastien Canard

Olivier Sanders

One embodiment relates to a method for enabling an entity to delegate calculation of a bilinear pairing value e(A,B) between two values A and B to a calculation server. The entity may select public elements Pand Pand secret elements Sand S, two of the elements from among P, P, S, and Sbeing selected to be equal to A and B, generate elements R=vS, R=uS, T=uP+S, T=vP=S, whereandare random numbers, and transmit R, R, T, and Tto the calculation server. The server may calculate (a)=e(T,T)[e(R,P)e(P,R)], and (a)=e(D,D),anddesignating two integers equal to 1 or to an integer, Dand Ddesignating two public elements from among A and B or from among Rand Rand transmit aand ato the entity. The entity may obtain the value e(A,B) from aor a

Method and system for delegating calculation of a bilinear pairing value to a calculation server

One embodiment relates to a method of updating, by an electronic device of a first user of a tree of data files and/or folders of the first user stored in a storage server configured to implement a re-encryption mechanism, this tree comprising at least one target folder that the first user has authorized a second user to access by providing the storage server with a re-encryption key for this target folder from the first user to the second user.

Growing community of inventors

Caen, France

Julien Devigne