Abstract: A method for authenticating a transaction is disclosed. The method comprises the steps of: receiving data identifying a region where a transaction is being requested; receiving data identifying a mobile communication device associated with a person requesting the transaction; determining from Location Register (LR) data for the mobile communication device data identifying a region where the mobile communication device is located; comparing the data identifying the region where the transaction is being requested with the data identifying the region where the mobile communication device is located; and authenticating the transaction in dependence on the result of the comparison.

Abstract: A method for authorising a remote transaction comprises receiving a request to complete a remote transaction from a remote user, for example over the Internet. A telephone number of a telephone, in particular a mobile telephone, associated with the remote user is identified in a database. A subscriber identity associated with the telephone number is requested from a telephone network operator associated with the identified telephone number. The subscriber identity received from the network operator is compared with a stored subscriber identity associated with the remote user. If the received subscriber identity matches the stored subscriber identity authentication information is communicated with the remote user via the telephone. If the received subscriber identity does not match the stored subscriber identity additional identifying information is requested from the remote user.

Abstract: A method, system and apparatus for authenticating the validity of a transaction. The method includes the steps of receiving data identifying a means for carrying out the financial transaction; receiving data identifying a mobile network segment for routing communications via a mobile communication device associated with a user requesting the transaction; comparing the mobile network segment data and the data identifying the means for carrying out the transaction with a database of correlated data identifying one or more means for carrying out a transaction associated with further data identifying one or more mobile network segments; and authenticating the transaction in dependence on the result of the comparison.

Abstract: A method for authenticating a transaction is disclosed. The method comprises the steps of: receiving data identifying a region where a transaction is being requested; receiving data identifying a mobile communication device associated with a person requesting the transaction; determining from Location Register (LR) data for the mobile communication device data identifying a region where the mobile communication device is located; comparing the data identifying the region where the transaction is being requested with the data identifying the region where the mobile communication device is located; and authenticating the transaction in dependence on the result of the comparison.