| 摘要 |
The present invention relates to a method of providing a key, in particular for digitally signing, verifying or encrypting data to be exchanged between a first party and a second party, comprising steps of transmitting (100) an identification code, which is uniquely identifying said first party, from said first party to a gateway (CCBS), verifying (110) said identification code by said gateway (CCBS) by using (111) an authentication server (AUC), and creating (120) a signing key. Said method is characterized by providing (130) said signing key to said first party and/or to said second party. <??>A transmission of said signing key via a secure communications channel, in particular via a GSM-based communications infrastructure, improves the security of payment transactions. <??>The present invention further relates to a mobile terminal (1) and a gateway (CCBS). <IMAGE> <IMAGE> <IMAGE>
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