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TSEC/KIV-7 devices are cryptographic devices developed by the National Security Agency, with two full-duplex channels operating as fast as 100 Mbps. Different versions provide bulk encryption alone, link- and packet-level encryption, and encryption that meets the specialized resynchronization requirements of time domain multiple access multiplexed networks. It is slower than the TSEC/KIV-19, which is replacing it in TROJAN SPIRIT applications.

Packet encryption follows the High Assurance Internet Protocol Encryption Interoperability Specification (HAIPE IS), the core interoperability specification as NSA moves to Internet Protocol-based routed communications.

In link mode, it interoperates with the older KG-84 family. Like the KG-84, it uses the classified encryption algorithm nicknamed WINDSTER. Various KIV-7 family devices are essentially miniaturized KG-84's, small enough to be embedded in radios and other electronics. Embedded devices are slower, in the 512 Kbps range.