Perform the operation a digital signature on a transaction, including through a communication channel such as the mobile network and using mobile phone etc. mobile signature is called. Technology, mobile signature to the citizens of this allows remote and distance the possibility of confirming a transaction, the electronic. Mobile signature can be information authentication identity of the mobile network at the disposal of a provider of online services, who provide services to, authentication, citizens need?. This signature should guarantee information other Olivia s by citizen, etc., the same transactions that in the request message signature and raised this as a matter of principle in the mobile signature is accepted. To this principle in the world. WYSWYS said to be. Mobile signature in different ways, such as by an application on the mobile phone, a sim smart card or to mediate a specific kind of memory, the SD may take place. In the following figure: scheme of the method based on the SIM card is displayed.