METHOD OF DISTRIBUTING AN AUTHENTICATION KEY, CORRESPONDING TERMINAL, MOBILITY SERVER AND COMPUTER PROGRAMS

A method and apparatus are provided for early distribution of at least one encryption key intended for securing a communication to be set up on the link layer of a cellular network formed of a plurality of cells, each controlled by an attachment point, between a mobile terminal and a set of attachment points, termed the target attachment points. The includes, for at least one target attachment point: creation of an encryption ticket containing an encryption key, enciphered on the basis of at least one authentication key specific to this target attachment point; receipt of the enciphered encryption ticket, by way of a current attachment point to which the mobile terminal is connected; identification, of a means of deciphering the enciphered encryption ticket, with the aid of the at least one authentication key, making it possible to obtain the encryption key.