METHOD FOR SERVER ASSISTED KEYSTORE PROTECTION

The present invention relates to a method to access a data store (DS) previously locked using a passphrase (PP) from a device (UD), said method including the following steps, when the user request access to the data store (DS): - requesting (E0) the user to enter the personal code (PIN), - generating (E2) an access code (AC) by applying said first function (F1) to at least the entered personal code (PIN); - sending out (E3), to the server (SV), at least an identifier (ID UD ) of the device (UD) and the access code (AC); - for the server (SV), comparing (E4) the access code (AC) with the preliminary received first function; - for the server (SV), if the access code (AC) is correct, returning the passphrase (PP) to the device (UD); - for the device (DV), unlocking the data store (DS) using the received passphrase (PP) in combination with the entered personal code (PIN).