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Multipathing traffic to reduce entry node exposure in onion routing

: Pennekamp, Jan; Hiller, Jens; Reuter, Sebastian; Cadena, Wladimir de la; Mitseva, Asya; Henze, Martin; Engel, Thomas; Wehrle, Klaus; Panchenko, Andriy


Institute of Electrical and Electronics Engineers -IEEE-:
IEEE 27th International Conference on Network Protocols, ICNP 2019 : Chicago, Illinois, USA, October 7-10, 2019
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-2701-9
ISBN: 978-1-7281-2700-2
International Conference on Network Protocols (ICNP) <27, 2019, Chicago/Ill.>
Fraunhofer FKIE ()

Users of an onion routing network, such as Tor, depend on its anonymity properties. However, especially malicious entry nodes, which know the client's identity, can also observe the whole communication on their link to the client and, thus, conduct several de-anonymization attacks. To limit this exposure and to impede corresponding attacks, we propose to multipath traffic between the client and the middle node to reduce the information an attacker can obtain at a single vantage point. To facilitate the deployment, only clients and selected middle nodes need to implement our approach, which works transparently for the remaining legacy nodes. Furthermore, we let clients control the splitting strategy to prevent any external manipulation.