| DNS provides integrity through the use of TSIG and DNSSEC, however, it does not provide confidentiality. Confidentiality of DNS data transfers, to include dynamic updates and zone transfers, must be obtained via an encrypted method, such as Transport Layer Security (TLS), SSL VPN, or IPSEC tunnel.
Alternative physical protection measures include Protected Distribution Systems (PDS). PDS are used to transmit unencrypted classified NSI through an area of lesser classification or control. In as much as the classified NSI is unencrypted, the PDS must provide adequate electrical, electromagnetic, and physical safeguards to deter exploitation. Refer to NSTSSI No. 7003 for additional details on a PDS.
Dynamic updates operate between clients and authoritative servers. The records that are updated with this mechanism are then made publicly available. Therefore, there is no need to encrypt dynamic updates to records. |
