CONTROL OF AN ENTITY TO BE CONTROLLED BY A CONTROL ENTITY

摘要

A control entity (11) communicates with an entity to be controlled (12) so as to effect a control, a secret key being associated with the control entity. These entities share public parameters (g, gv), a second public parameter (gv) being a combination of a first public parameter (g) of the said plurality with the secret key (v). At the level of the entity to be controlled, a random value (r1) is generated, a first message is transmitted to the control entity, this first message comprising at least one value (x) obtained by combining the first public parameter (g) with the random value; and a second message is transmitted to the control entity, this second message comprising at least one value (y) obtained by combining the first random value (r1), a secret key of the entity to be controlled (s) and a value received from the control entity (C). One of the values included in the first or the second message is based on the second public parameter (gv).