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Galois field
A finite field.

Gateway
A machine or set of machines that provides relay services between two networks.

General Support System
An interconnected set of information resources under the same direct management control which shares common functionality. A system normally includes hardware, software, information, data, applications, communications, and people. A system can be, for example, a local area network (LAN) including smart terminals that support a branch office, an agency-wide backbone, a communications network, a departmental data processing center including its operating system and utilities, a tactical radio network, or a shared information processing service organization (IPSO).

Goppa code
A class of error correcting codes, used in the McEliece public-key cryptosystem.

GSS-API
Generic security service application program interface.