A secure archive for Voice-over-IP conversations - Christian Hett; Nicolai Kuntze; Andreas U. Schmidt (CoRR, 2006)

Security and Non-Repudiation for Voice-Over-IP Conversations - Christian Hett; Nicolai Kuntze; Andreas U. Schmidt (CoRR, 2006)

Non-Repudiation in Internet Telephony. - Nicolai Kuntze; Andreas U. Schmidt; Christian Hett (SEC, 2007)