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imported>Howard C. Berkowitz (New page: '''Availability''' of an information service means that authorized users can depend on being able to use it whenever it is needed. In U.S. law, a definition is "Ensuring timely and reliabl...) |
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'''Availability''' of an information service means that authorized users can depend on being able to use it whenever it is needed. In U.S. law, a definition is "Ensuring timely and reliable access to and use of information." <ref>44 USC 3542</ref> | {{subpages}} | ||
'''Availability''' of an information service, in the context of [[information security]] means that authorized users can depend on being able to use it whenever it is needed. In U.S. law, a definition is "Ensuring timely and reliable access to and use of information." <ref>44 USC 3542</ref> | |||
To specify availability in detail, however, can be quite complex. For example, if a service is offered only during normal business hours between 9 and 5, the service fails at 4, is repaired at 11, and is working the next morning, has it been unavailable for: | To specify availability in detail, however, can be quite complex. For example, if a service is offered only during normal business hours between 9 and 5, the service fails at 4, is repaired at 11, and is working the next morning, has it been unavailable for: | ||
*1 hour, the period of outage during business hours | *1 hour, the period of outage during business hours | ||
*7 hours, the actual period the service was unusable ''if'' someone attempted to use it | *7 hours, the actual period the service was unusable ''if'' someone attempted to use it | ||
*17 hours, the perceived period of outage if someone saw it fail and left for the day, not knowing he could respect it in the morning | *17 hours, the perceived period of outage if someone saw it fail and left for the day, not knowing he could respect it in the morning | ||
==References== | |||
{{reflist}}[[Category:Suggestion Bot Tag]] |
Latest revision as of 07:00, 15 July 2024
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Availability of an information service, in the context of information security means that authorized users can depend on being able to use it whenever it is needed. In U.S. law, a definition is "Ensuring timely and reliable access to and use of information." [1]
To specify availability in detail, however, can be quite complex. For example, if a service is offered only during normal business hours between 9 and 5, the service fails at 4, is repaired at 11, and is working the next morning, has it been unavailable for:
- 1 hour, the period of outage during business hours
- 7 hours, the actual period the service was unusable if someone attempted to use it
- 17 hours, the perceived period of outage if someone saw it fail and left for the day, not knowing he could respect it in the morning
References
- ↑ 44 USC 3542