Authenticating denial of existence in DNS with minimum disclosure (or; An alternative to DNSSEC NXT records)

Document Type Expired Internet-Draft (dnsext WG)
Last updated 2000-11-29
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This draft present an alternative to NXT records, used to achieve authenticated denial of existence of a domain name, class and type. Problems with NXT records, as specified in RFC 2535, are identified. One solution, the NO record, is presented. The NO record differ from the NXT record by using a cryptographic hash value instead of the domain name. This prevent an adversery from collecting information by 'chaining' through a zone. It also remove delegation point concerns in NXT records. The document also describe hash truncation and record merging that reduces storage/network load.


Simon Josefsson (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)