Robert Lee Pfeifer

US Patent:

48888010, Dec 19, 1989

Filed:

May 2, 1988

Appl. No.:

7/188868

Inventors:

Robert I. Foster - Mesa AZ
Robert F. Pfeifer - Scottsdale AZ
Thomas J. Mihm - Mesa AZ

Assignee:

Motorola, Inc.

International Classification:

H04L 902

US Classification:

380 21

Abstract:

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.

US Patent:

D2558998, Jul 15, 1980

Filed:

Jun 8, 1978

Appl. No.:

5/913929

Inventors:

Joseph W. Karas - Phoenix AZ
Robert F. Pfeifer - Phoenix AZ
Robert Samson - Phoenix AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

D1402

US Classification:

D14 42

US Patent:

42812160, Jul 28, 1981

Filed:

Apr 2, 1979

Appl. No.:

6/025951

Inventors:

Gerald J. Hogg - Tempe AZ
Robert A. Newman - Phoenix AZ
Robert F. Pfeifer - Phoenix AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H04L 900

US Classification:

178 2208

Abstract:

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.

US Patent:

43529526, Oct 5, 1982

Filed:

Mar 3, 1980

Appl. No.:

6/126808

Inventors:

Charles A. Boone - Mesa AZ
Robert F. Pfeifer - Phoenix AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H04L 900

US Classification:

178 2209

Abstract:

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.

US Patent:

D2648431, Jun 8, 1982

Filed:

Apr 2, 1979

Appl. No.:

6/025955

Inventors:

Joseph W. Karas - Phoenix AZ
Robert F. Pfeifer - Phoenix AZ
Robert Samson - Scottsdale AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

D1402
D1303

US Classification:

D14100

US Patent:

D2633957, Mar 16, 1982

Filed:

Apr 2, 1979

Appl. No.:

6/025956

Inventors:

Joseph W. Karas - Phoenix AZ
Robert F. Pfeifer - Phoenix AZ
Robert Samson - Scottsdale AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

D1402
D1303

US Classification:

D14100