http://www.rfc-editor.org/rfc/rfc4641.txt
RFC 4641: DNSSEC Operational Practices, O. Kolkman, R. Gieben2006-09-01T23:00:00-00:00This document obsoletes RFC 2541, as it covers more operational ground and gives more up-to-date requirements with respect to key sizes and the new DNSSEC specification. This memo provides information for the Internet community.