AN/PYQ-10

The AN/PYQ-10 Simple Key Loader (SKL) is a ruggedized, portable, hand-held fill device, for securely receiving, storing, and transferring data between compatible cryptographic and communications equipment.

The SKL was designed and built by Ralph Osterhout[citation needed] and then sold to Sierra Nevada Corporation, with software developed by Science Applications International Corporation (SAIC) under the auspices of the United States Army.

It is intended to supplement and eventually replace the AN/CYZ-10 Data Transfer Device (DTD).

Cryptographic functions are performed by an embedded KOV-21 card developed by the National Security Agency (NSA).

[1] The SKL is backward-compatible with existing End Cryptographic Units (ECU) and forward-compatible with future security equipment and systems, including NSA's Key Management Infrastructure.