A method for reprogramming bidirectional objects is disclosed. The objects contain a common key, at least two objects being paired to allow the sending of a command from one object of the pair to the other object of the pair and the execution of the command by the other object. The method includes the steps of 1) providing the objects with a new common key; 2) then when a command is sent from one object to another object with which it is paired, verifying that the two objects contain the new common key, and 3) refusal by the other object to execute the command if the two objects do not contain the new common key.