The invention relates to a method for secure communications in a telecommunications network, said network comprising a group of servers Si (where i=1, 2, . . . , p, and p is a strictly positive integer), referred to as Authorization Servers. For a transaction between an entity A and an entity B of said network, this method comprises the following steps: a) entity A sends to one of the Authorization Servers Si an authorization request in which the entity A identifies and authenticates itself as the holder of an identifier IDA; b) the entity A declares to said Authorization Server Si its intention to communicate with the entity B and the Authorization Server Si determines an individual secret key KSiB which it shares with this entity B; c) the Authorization Server Si generates a session key KN,SiAB and sends said session key KN,SiAB to the entity A; d) the Authorization Server Si generates a transaction identifier IDTRN,Si; e) the authorization server Si supplies the entity B with elements comprising at least said transaction identifier IDTRN,Si; f) using this transaction identifier IDTRN,Si, the entity B checks the validity of the transaction, and g) the entity B generates the session key KN,SiAB.