Deutschetelekom Ag

Alfred Scheerhorn

Klaus Huber

Frank Schaefer-Lorinser

A method and/or system for transmitting sequences of signals/data from a transmitter to a receiver and for authenticating the sequences of signals/data may consist of a precalculation phase and of a communication phase in which the signals are transmitted together with the checking sums. In the precalculation phase, a pseudo-random sequence may be first generated by means of a cryptographic algorithm from a time-variable parameter and other initialization data. Non-overlapping sections (z() of a sequence (z) having each m bits may be associated to signals (s(i)), wherein i=1, 2, . . . n, of a signal storage. Further non-overlapping m bit sections (t(i)) of the remaining sequence may be selected for coding numbers (1, 2, . . . MAX). The transmitter may transmit the initialization information and the time-variable parameters to the receiver and the receiver may calculate the pseudo-random sequence (z) and checks the receiver authentication token (T). The transmitter may accept the received signals as being authentic when the received authentication tokens match the calculated ones.

Method of transmitting signals

A method for enhancing data security when chip cards are used for payment transactions and input data are loaded into an algorithm when performing an authentication. The security of the debit and credit data is enhanced by subdividing the data blocks and by switching an additional feedback on and off following the downstream counters at preselected clock pulse times. The method is applicable to all authentication processes in conjunction with chip cards.

Growing community of inventors

Meppen, Germany

Alfred Scheerhorn