Patent ID: 8522028
Filing Date: 2013-08-27
Classification: G06F,H04L,H04N

Abstract:
1. Data exchange method between two devices locally connected to one another, a first device of the two devices being a security module and a second device of the two devices being a receiver, the first device comprising at least one first encrypting key of a pair of asymmetric keys and the second device comprising at least the second encrypting key of said pair of asymmetric keys, this method comprising: generating, at least one first random number in the first device, generating, at least one second random number in the second device, encrypting said first random number by said first encrypting key, the first encrypting key initialized in the first device during an initialization phase of the first device in a first protected environment, encrypting said second random number by said second encrypting key, the second encrypting key initialized in the second device during an initialization phase of the second device in a second protected environment, transmitting said first encrypted random number to the second device, transmitting said second encrypted random number to the first device, decrypting the first encrypted random number in said second device, decrypting the second encrypted random number in said first device, combining said random numbers generated by one of the devices and received by the other device to generate a session key, and using the session key to encrypt and decrypt all or part of the exchanged data between the first and second device wherein at least one of the two devices measures at least one representative physical parameter of the communication, the at least one representative physical parameter including at least one of a line impedance and an electric consumption, wherein at least one of the two devices compares the values measured to reference values, and wherein at least one of the two devices acts on the data exchange when the measured parameters differ from the reference values more than a threshold value.