Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Non-repudiation in internet telephony

: Kuntze, N.; Schmidt, A.U.; Hett, C.


Venter, H. ; International Federation for Information Processing -IFIP-, Technical Committee 11, Security and Protection in Information Processing Systems:
New approaches for security, privacy and trust in complex environments. Proceedings of the IFIP TC 11 22nd International Information Security Conference, SEC 2007 : 14-16 May 2007, Sandton, South Africa
Berlin: Springer, 2007 (IFIP International Federation for Information Processing 232)
ISBN: 978-0-387-72366-2
ISBN: 0-387-72366-8
International Information Security Conference (SEC) <22, 2007, Sandton>
Fraunhofer SIT ()

We present a concept to achieve non-repudiation for natural language conversations over the Internet. The method rests on chained electronic signatures applied to pieces of packet-based, digital, voice communication. It establishes the integrity and authenticity of the bidirectional data stream and its temporal sequence and thus the security context of a conversation. The concept is close to the protocols for Voice over the Internet (VoIP), provides a high level of inherent security, and extends naturally to multilateral non-repudiation,e.g., for conferences. Signatures over conversations can become true declarations of will in analogy to electronically signed, digital documents. This enables binding verbal contracts, in principle between unacquainted speakers, and in particular without witnesses. A reference implementation of a secure VoIP archive is exhibited.