The document discusses securing multicast conferencing. It describes how multicast conferencing involves sharing audio, video and whiteboards but securing it is challenging due to the need to share keys between group members. It proposes using session descriptions distributed via secure means like S/MIME email or TLS-protected web servers to distribute security parameters to authorized members to enable secure multicast conferencing. New techniques are still needed to allow for encrypted data to be processed by intermediate nodes like proxies without revealing security keys.

1. Secure multicast conferencing Peter Kirstein, Ian Brown and Edmund Whelan University College London IDC’99, Madrid 23 Sept. 1999 Ian Brown, UCL