RFC 2426, September 1998.
[SILC1] Riikonen, P., "Secure Internet Live Conferencing (SILC),
- Protocol Specification", Internet Draft, April 2001.
+ Protocol Specification", Internet Draft, May 2002.
[RFC2440] Callas, J., et al, "OpenPGP Message Format", RFC 2440,
November 1998.