US 12,407,507 B2
Method for data transfer and communication system
Marcel Jähn, Braunschweig (DE); Matthias Lorenz, Vechelde (DE); and Benjamin Schilling, Wolfenbüttel (DE)
Assigned to Siemens Mobility GmbH, Munich (DE)
Appl. No. 17/914,846
Filed by Siemens Mobility GmbH, Munich (DE)
PCT Filed Mar. 15, 2021, PCT No. PCT/EP2021/056482
§ 371(c)(1), (2) Date Sep. 27, 2022,
PCT Pub. No. WO2021/190969, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 10 2020 204 023.0 (DE), filed on Mar. 27, 2020.
Prior Publication US 2023/0145277 A1, May 11, 2023
Int. Cl. H04L 9/08 (2006.01); H04L 9/06 (2006.01); H04L 9/14 (2006.01); H04L 9/40 (2022.01); H04L 47/12 (2022.01)
CPC H04L 9/0891 (2013.01) [H04L 9/0637 (2013.01); H04L 9/0822 (2013.01); H04L 9/0825 (2013.01); H04L 9/14 (2013.01); H04L 47/12 (2013.01); H04L 63/0442 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for data transfer, which comprises the following steps of:
establishing a data connection with a connection key between a first communication partner and a second communication partner;
encrypting the connection key for the data connection by the first communication partner and/or by the second communication partner with an additional key;
sending a message containing an unencrypted part and a part encrypted with the connection key from the first communication partner to the second communication partner, wherein the unencrypted part of the message contains the connection key encrypted with the additional key;
wherein a third communication partner is intentionally participating as a listener in the data connection and the additional key is known to the third communication partner, said third communication partner being specifically included in the data connection by at least one of said first communication partner or said second communication partner, said third communication partner at least one of logging or inspecting the message on behalf of said at least one of said first communication partner or said second communication partner; and
decrypting, by the third communication partner, the connection key encrypted with the additional key from the unencrypted part of the message, so it is possible for the third communication partner to read the encrypted part of the message.