Method for processing an operation involving secret data, terminal, system and corresponding computer program

Abstract

A method for processing a transaction using a transaction device of a user, carried out within an electronic transaction terminal called a transaction terminal, and includes at least one connection interface for connecting to at least one communication network. Such a method includes: determining the availability of a communication network recorded in a secure memory space of the terminal; receiving an instruction to carry out a transaction; and selecting from an online transaction component and an autonomous transaction component, a transaction component to be activated in accordance with the communication network availability, the autonomous transaction component being activated when any communication network is unavailable, and carrying out the transaction by means of the activated transaction component, the transaction components using a root component which executes basic functions common to the two transaction components, the functions of the root component being protected and only accessible when read by the transaction components.