New PDF release: An Information Security Handbook
By John M. D. Hunter BA (Hons), FBCS, CEng (auth.)
Aimed basically at ultimate 12 months undergraduate classes and MSc classes on info structures, administration of knowledge structures and layout of data platforms, this textbook goals to supply solutions to 5 questions;
What is protection? What are the safety difficulties specific to an IT procedure? What will be performed to lessen the safety dangers linked to any such approach? In a given state of affairs, what are the best defense countermeasures? How may still one set approximately buying a knowledge method with protection implications?
It appears on the diverse objectives agencies may have in utilising defense thoughts (availability, integrity, confidentiality, exclusivity) and which approach is most fitted to attaining each one target. With guidance acceptable for the safety of either traditional advertisement and armed forces structures, An details defense Handbook can be of curiosity to laptop process managers and directors in any advertisement or executive organisation.
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Extra resources for An Information Security Handbook
However, such an arrangement does not increase the availability of the data. RAID level 1 consists of mirroring: there are two identical sets of discs each with identical copies of the data. This arrangement provides greatly improved data availability: the chances of both sets of data failing at the same time are very low. 6 Summary 27 identified and replaced quickly, single component failures have a minimal effect on an operational system. There are costs : there has to be at least double the disc capacity to hold the mirror copy and all write/update operations have to be duplicated.
Hunter, An Information Security Handbook © Springer-Verlag London Limited 2001 42 5. Communications Security govern ment organisation and totally impractical for a commercial concern . For t he secur ity of the cables, one has to rely on communications suppliers (in the UK , companies such as BT and Mercury) hiding physical circuits in t heir communicat ions networks, and, t he honesty and t rustworthiness of their employees. Should an attacker gain access to almost any par t of the communications system, t here ar e a numb er of quite sophisticate d att acks which can be moun ted: • From a passive tap , one can derive quite a lot of useful user information.
The slowest are the QIC tapes. The best compromise in terms of performance and costs is with the Exabyte tapes. Writing to and reading from magnetic tapes is achieved by moving the tape over a fixed set of heads . A big difference between tapes and discs is that tapes can write arbitrary length data blocks to the tapes. 4 Files and Access Control 21 block size of 64kB . As well as writing data blocks to tapes , it is also possibl e to write senti n el blocks (also known as tape marks) . These ar e useful to mark cont rol points on th e tape.
An Information Security Handbook by John M. D. Hunter BA (Hons), FBCS, CEng (auth.)