16. A method for obtaining a cryptographic credential using a zone secured by domain name system (“DNS”)-based authentication of named entities (“DANE”) using DNS security extensions (“DNSSEC”) comprising: obtaining, at a DNS resolver over a network, a request from a first client for a cryptographic credential associated with a second client; providing, by the DNS resolver, the request to a DNS provider; obtaining, from the DNS provider, the cryptographic credential associated with the second client, wherein the cryptographic credential is contained in the zone that is secured using DNSSEC and DANE; verifying, by a hardware processor of the DNS resolver, that the cryptographic credential is authentic; providing, over a network, the cryptographic credential to the first client.
16. A method for obtaining a cryptographic credential using a zone secured by domain name system (“DNS”)-based authentication of named entities (“DANE”) using DNS security extensions (“DNSSEC”) comprising: obtaining, at a DNS resolver over a network, a request from a first client for a cryptographic credential associated with a second client; providing, by the DNS resolver, the request to a DNS provider; obtaining, from the DNS provider, the cryptographic credential associated with the second client, wherein the cryptographic credential is contained in the zone that is secured using DNSSEC and DANE; verifying, by a hardware processor of the DNS resolver, that the cryptographic credential is authentic; providing, over a network, the cryptographic credential to the first client. 17. The method of claim 16 , wherein the cryptographic credential is a Secure/Multipurpose Internet Mail Extensions (“S/MIME”) key or a Pretty Good Privacy (“PGP’) key.