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Server Name Indication (SNI) transmits a virtual domain name during the TLS negotiation process so that a server with a single IP address can support multiple virtual domains, instead of requiring a unique IP address for each TLS host. SNI does not conceal the requested hostname so it can be used for network filtering which is a privacy concern. ESNI - Encrypted SNI - replaces the server name in the ClientHello message with an encrypted equivalent. It is placed in the DNS records as a TXT record. It has a checksum which uses the first 4 octets of the SHA-256 message digest, padding, and a validity period. However the specifications suggest the expiry date should not be used for caching to allow servers to rotate the encryption keys.
KSK = Key Signing Key ZSK = Zone Signing Key RZM = Root Zone Maintainer DNS = Domain Name System (or Server) The KSK will be used to sign the root zone for the first time on October 11, 2017 at 1600 UTC. The KSK is used to sign the ZSK, which is used by the root zone maintainer (RZM) to DNSSEC-sign the root zone of the Domain Name System. The change will upgrade the ZSK to a 2048-bit RSA key to improve security for resolving domain names. For more information see https://automated-ksk-test.research.icann.org/