Introduction to Information Security


Computer Systems Security



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Computer Systems Security


Communication protection

Communications security (COMSEC)

  • Measures and controls taken to deny unauthorized persons information derived from telecommunications and ensure the authenticity of such telecommunications.

Communications security (COMSEC)

  • Communications security includes
    • cryptosecurity,
    • transmission security,
    • emission security,
    • traffic-flow security
    • physical security of COMSEC equipment.

cryptosecurity

  • The component of communications security that results from the provision of technically sound cryptosystems and their proper use.
  • This includes insuring message confidentiality and authenticity.

Traffic-flow security

  • The use of measures that conceal the presence and properties of valid messages on a network to prevent traffic analysis.
  • This can be done by operational procedures or by the protection resulting from features inherent in some cryptographic equipment.

Traffic-flow security Techniques

  • changing radio callsigns frequently
  • encryption of a message's sending and receiving addresses (codress messages)
  • causing the circuit to appear busy at all times or much of the time by sending dummy traffic
  • sending a continuous encrypted signal, whether or not traffic is being transmitted.

Transmission security (TRANSEC)

  • Protect transmissions from interception and exploitation by means other than cryptanalysis.
  • Examples are frequency hopping and spread spectrum

Transmission security (TRANSEC)

  • security include:
    • Low probability of interception
    • Low probability of detection
    • Antijam — resistance to jamming

Emission security (EMSEC)

  • Protection resulting from all measures taken to deny unauthorized persons information of value which might be derived from intercept and analysis of compromising emanations from crypto-equipment, automated information systems (computers), and telecommunications systems.

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