The first ten years of public-key cryptography

Article Abstract:

Public-key cryptosystems enable secure communications networks through use of a related pair of keys: a public one and a secret one, of which only the latter can decrypt the former. This dichotomy allows several individuals to encrypt messages that can only be read by one person, or one person to encrypt a message such that many people can read it. Both the government and private firms have developed products facilitating public-key cryptosystem technology; several products are briefly described. The advent of public-key cryptosystems has also propelled cryptologic research, particularly in the direction of devising approaches to the development of cryptographic protocols that address particular security objectives. Details of the development of public-key cryptosystems are described.

Encryption, Data encryption, Industrial research, Product introduction, Cryptography, Research and Development, Trends, Industry Analysis, New Technique, Public Key Cryptosystems

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NASA's advanced Tracking and Data Relay Satellite System for the years 2000 and beyond

Article Abstract:

NASA's Tracking and Data Relay Satellite System (TDRSS) provides near-worldwide coverage to manned and unmanned low-earth-orbiting spacecraft. It is expected to function until the late 1990s when the current TDRSS space resources will be expended. The follow-on, currently called the Advanced TDRSS (ATDRSS), is in the conceptual development stage. ATDRSS is expected to provide continuous and automatic tracking, have improved user tracking, have autonomous user navigation, and have near-real-time service access. It will have an upgraded ground segment. Its satellite constellation will consist of two satellites in each of the east and west locations.

Tracking systems (Navigation), Space Craft, NASA, Tracking Systems

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NAVSTAR: Global Positioning System - Ten Years Later

Article Abstract:

The history and background of the NAVSTAR Global Positioning System (GPS) is discussed. The satellites, ground- based control networks, and user equipment are introduced. NAVSTAR GPS is primarily a Department of Defense project.

Transportation, Navigation, Government Agency, Military, Aircraft, Maritime Shipping, NAVSTAR GPS

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