Algorithm for DNSSEC Trusted Key Rollover

International audienceThe Domain Name System Security Extensions (DNSSEC) architecture is based on public-key cryptography. A secure DNS zone has one or more keys and signs its resource records with these keys in order to provide two security services: data integrity and authentication. These services allow to protect DNS transactions and permit the detection of attempted attacks on DNS. The DNSSEC validation process is based on the establishment of a chain of trust between zones. This chain needs a secure entry point: a DNS zone whose at least one key is trusted. In this paper we study a critical problem associated to the key rollover in DNSSEC: the trusted keys rollover problem. We propose an algorithm that allows a resolver to update its trusted keys automatically and in a secure way without any delay or any break of the DNS service