A cryptographic framework consists of four basic service elements that include a national flag card, a cryptographic unit, a host system, and a network security server. Three of the four service elements have a fundamentally hierarchical relationship. The National Flag Card (NFC) is installed into the...http://www.google.de/patents/US5907620?utm_source=gb-gplus-sharePatent US5907620 - Method and apparatus for enforcing the use of cryptography in an international cryptography framework
