The KSV-21 Enhanced Crypto Card is a US National Security Agency-approved PC card that provides Type 1 encryption functions and key storage to the STE secure telephones and other devices.
The KSV-21 was originally built by SafeNet but has since been purchased by Raytheon[1] as a tamper-resistant reprogrammable module and is backwards compatible with the KOV-14 Fortezza Plus card.
It adds features including support for SCIP, Enhanced Firefly and NSA's 21st century Key Management Initiative.
[2] The US version is certified to protect classified data through the Top Secret/SCI level as well as unclassified sensitive information.
Versions are available for use with other nations, including: Prices range from $900 for single units to under $400/each in multi-thousand lot quantities as of 2008.