Method for Generating a Secret or a Key in a Network

A method for generating one of a secret and a key with a first user of a network, the first user being is configured to receive information via a transmission channel from a second user of the network and to transmit information to the second user, the first user being configured to provide at least a first value and a second value to the transmission channel and to be able to detect the first value and the second value, the method comprising:

• transmitting, with the first user, a first user value sequence synchronously to a transmission of a second user value sequence by the second user on the transmission channel;
• generating one of a common secret and a common key, with the first user based on information about the first user value sequence and based on the basis of a superimposition value sequence which results on the transmission channel from the superimposition of the first user value sequence with the second user value sequence;
• and
• providing, one of at particular intervals and depending on a detected superimposition value sequence, with the first user, at least a first stuffing value outside the first user value sequence to the transmission channel, such that one of a change of edges and a change of values takes place on the transmission channel.

A network comprising:

• a first user, the first user being configured to provide at least a first value and a second value to the transmission channel;
• a second user, the second user being configured to provide at least the first value and the second value to the transmission channel;
• and
• a transmission channel, via which the first user communicates with the second user,
• wherein the first user is configured to transmit a first user value sequence on the transmission channel and the second user is configured to transmit a second user value sequence the transmission channel synchronously with the transmission of the first user value sequence,
• wherein the first user is configured to generate one of a common secret and a common key, based on information about the first user value sequence and based on a superimposition value sequence resulting from a superimposition of the first user value sequence with the second user value sequence on the transmission channel,
• wherein the second user is configured to generate one of a common secret and a common key, based on information about the second user value sequence and based on the superimposition value sequence resulting from the superimposition of the first user value sequence with the second user value sequence on the transmission channel, and
• wherein at least one stuffing value to the transmission channel, one of (i) at particular intervals and (ii) depending on a detected superimposition value sequence, is provided one of (i) with the first user outside of the first user value sequence and (ii) with the second user outside of the second user value sequence, such that one of a change of edges and a change of values takes place on the transmission channel.