Patent ID: 8346213
Filing Date: 2013-01-01
Classification: H04L,H04M,H04W

Abstract:
1. A method of protecting AT commands during the interaction between an AT command module of a mobile terminal and a serial communication unit of an external device, comprising the steps of: (1) receiving said AT commands from said serial communication unit to said AT command module; (2) putting said AT command module into an ID verification mode, wherein said AT command module receives a username and password from said serial communication unit in turn, and verifies said received username and password, comprising the steps of: (3) when said ID verification is successful, putting said AT command module into an AT command processing state, wherein both step (b) and (d) comprise steps of: reading said received character from a receiving buffer; and determining whether said received character is password according to said flag variable; when said received character is password, sending a hidden character to said serial communication unit; when said received character is not password, sending said character back to said serial communication unit.