Fortezza

Each individual who is authorized to see protected information is issued a Fortezza card that stores private keys and other data needed to gain access.

It contains an NSA approved security microprocessor called Capstone (MYK-80) that implements the Skipjack encryption algorithm.

A later version, called KOV-14 or Fortezza Plus, uses a Krypton microprocessor that implements stronger, Type 1 encryption and may be used for information classified up to TOP SECRET/SCI.

The cards are interchangeable within the many types of equipment that support Fortezza and can be rekeyed and reprogrammed by the owners, making them easy to issue and reuse.

The Fortezza Plus card and its successors are used with NSA's Secure Terminal Equipment voice and data encryption systems that are replacing the STU-III.