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The term information system has the following meanings:

1. A system, whether automated or manual, that comprises people, machines, and/or methods organized to collect, process, transmit, and disseminate data that represent user information.

2. Any telecommunications and/or computer related equipment or interconnected system or subsystems of equipment that is used in the acquisition, storage, manipulation, management, movement, control, display, switching, interchange, transmission, or reception of voice and/or data, and includes software, firmware, and hardware

Source: from Federal Standard 1037C and from MIL-STD-188 and from the National Information Systems Security Glossary

The simplest model that describes the Structure and Behaviour of an Information System takes five objects:

For Structure:

  • Repositories, hold data permanent or temporarily, such as buffers, RAM, hard disks, cache, etc.
  • Interfaces, exchange information with the non-digital world, such as keyboards, speakers, scanners, printers, etc.
  • Channels, connect repositories, such as buses, cables, wireless links, etc. A Network is a set of logical or physical channels.

For Behaviour:

  • Services; provide value to users or to other services via messages interchange.
  • Messages; carries a meaning to users or services.

Source: from book "Seguridad de la Informacion", 2004 ISBN 84-933336-7-0


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