Patent ID: 7864954
Filing Date: 2011-01-04
Classification: H04L

Abstract:
1. A method for encrypted transmission or authentication between at least two key-generating units via an insecure communication channel, comprising the initiation steps of: in an initiation procedure, obtaining a common original value to be used in the respective key-generating units; and interconnecting the at least two key-generating units via the insecure communications channel, wherein the method for each encrypted transmission or authentication between the at least two key-generating units via the insecure communication channel further comprises the session steps of, changing autonomously, in a synchronised and periodical fashion, a common counting value in each key-generating unit, generating a common key on the basis of the original value and the counting value in each key-generating unit, independently of other key-generating units, wherein the key generation in each key-generating unit takes place without use of any information received from other key-generating units, and using the thus generated keys in a subsequent encrypted transmission or authentication operation, and wherein the key-generating units are configured to detect when the key-generating units are not synchronised and to then restore synchronisation.