Method of providing a signing key for digitally signing, verifying or encrypting data

The invention relates to a providing is used for special to the data digital signature, verification or for encrypting method for key first Quadrate Sides second ends of, comprising steps: From the first direction gateway (CCBS) to transmit (100) is identification to the first side the identification code, wherein the gateway (CCBS) by using (111) and authentication server (AUC) is confirmed (110) to the identification code, a (120) signature key. The method and is connected to the first side and/or said second Quadrate Tigong (130) to the signature key. Through the safety communication channel, especially a GSM-based the communication basic structure, transmitted to the signature key which the transaction secret safety. The invention also relates a mobile terminal (1) and gateway (CCBS).