Computer Science – Cryptography and Security
Scientific paper
2007-01-23
Computer Science
Cryptography and Security
Accepted full research paper at IFIP sec2007, Sandton, South Africa, 14-16 May 2007
Scientific paper
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.
Hett Christian
Kuntze Nicolai
Schmidt Andreas U.
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