Method and system for generating data transaction ID

摘要

A method for generating a data transaction ID for an interaction between first and second units, the method comprising: the first data unit generating a first data item as a function of a first time data element, the first time data element being representative of a first time value, and transmitting the first data item to the second data unit; the second data unit generating a second data item as a function of the received first data item and transmitting the second data item to the first data unit; and the first data unit generating a third data item as a function of the second data item and a second time data element, the second time data element being representative of a second time value, wherein the third data item comprises a transaction ID unique to the interaction between the first and second data units. Preferably the difference between the first and second real time values is determined and if it is greater then a predetermined time the data transaction ID is deemed invalid.