This whitepaper describes an approach to protect data using IP Crypto over HF communication. The approach described in this document is formally set out in the following open specication; “Providing STANAG 5066 services over UDP/IP” (S5066-APP4), “Implicit IP Client over STANAG 5066” (S5066-APP5), “Providing Control Parameters for STANAG 5066 over UDP/IP through IP Crypto” (S5066-APP6), and “XML Control Messages for STANAG 5066 over UDP/IP through a Data Diode” (S5066-APP7).