Patent ID: 7454618

Claim:
A method for transmitting information between a transmitting station and at least one receiving station, comprising: transmitting information encrypted with a first key and at least a message bearing a second key, from the transmitting station to the at least one receiving station, and decrypting encrypted information in the at least one receiving station using one selected from a group consisting of a rebuilt version of the first key and a key substantially identical to the first key, wherein the one of the rebuilt first key and the key substantially identical to the first key that is used to decrypt the encrypted information is generated in the receiving stations using the second key and at least one datum selected from a set of data available in the receiving stations, wherein the at least one datum is selected according to a selection command periodically transmitted between the transmitting station and the receiving stations, wherein the selection command comprises a pointer referencing at least one memory address location of the at least one datum used to generate the one of the rebuilt first key and the key substantially identical to the first key.