Ensuring the security of a data transmission

Method according to either of the above claims, wherein the prior enrollment step (INIT) comprises an association between:

• the authentic identity data item of the user, and
• a terminal data item,
• said association being stored with data for contacting the terminal via a network to which the terminal is connected.

Method according to any of the above claims, wherein the current verification step comprises:

• a verification of consistency between the stored data item specific to the user and a data item specific to the user entered by the user by means of the terminal, and
• a transmission of the derived identity stored in the terminal to a remote verification entity.

Method according to any of the above claims, wherein said derived identity is stored in storage means of a security element (SE) of the terminal.

Method according to any of the above claims, wherein the derived identity is sent to the terminal by an Over the Air technique together with data of an application running on the terminal in order to at least control the storing of the derived identity (SI).

Method according to any of the above claims, wherein the authentic identity data item of the user is provided, in said prior step, by reading (READ) a security component of an identity medium (OM) of the user.

Method according to any of the above claims, wherein, during said current step, the derived identity is sent from the terminal to a verification entity remote from the terminal and is verified by said entity (S24), the verification of the derived identity being validated at said entity if the data item specific to the user was also verified successfully by the terminal (S23).

Method according to any of the above claims, wherein an identifier (ID) is sent with data for contacting the terminal (TER) via a network, to a service platform, and if the identity verification is positive in the current step, the user is authorized to access informational data as a function of said identifier (ID).

Method for ensuring the security of a data transmission between a device (DEV) and a service platform (S-PLAT), comprising a verification of the identity of a user of the device according to said current step of the method according to any of the above claims, the method for ensuring the security comprising:

• a sending of contact data for the terminal to the service platform,
• the execution of the current step of identity verification, from the terminal of the user, and
• if the identity verification is positive, a step authorizing a data transmission between the device and the service platform.

Computer program comprising instructions for implementing a method according to any of the above claims, when this program is executed by a processor.