Motorola Corporation

Robert F Pfeifer

Joseph W Karas

Robert Samson

Thomas J Mihm, Jr

Robert I Foster

Gerald James Hogg

Robert A Newman

Charles A Boone

A hierarchical key management system includes a number of secure terminals. These terminals provide secure access to a corresponding number of users. A user inserts a security activation device or key into the secure terminal to access a secure connection through the established communication network. A group of secure wireline terminals is connected to a key certification authority. There may be several groups of key certification authorities and corresponding secure terminal users. At the highest level, a key certification center authorizes secure communications by the key certification authorities. In turn, the key certification authorities authorize secure communications between the users. As a result, if one level of key management is compromised, other levels and users are not affected.

Hierarchical key management system

A data security module for encrypting and decrypting computer data contains, in addition to the encryption logic, interface logic to allow direct memory access to a computer. The security module sits as a computer peripheral device and after being instructed as to the location and quantity of data by the computer, accesses the data directly from the computer memory without disturbing the processor to provide parallel encryption or decryption of computer memory data.

Data security module

Multiple module serial link encryption unit or similar article

In a data encryption/decryption system providing for security of data communications channels, a sub-system for generating, transporting encryption/decryption keys and for introducing those keys into the system while at the same time providing a high level of security for the keys and, hence, the encryption/decryption system.

Key management for encryption/decryption systems

Code entry terminal for security access system

Growing community of inventors

Phoenix, AZ, United States of America

Robert F Pfeifer