Data security and compaction techniques

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dc.contributor.authorMurphy, Timothy Fitzgeralden_US
dc.date.accessioned2024-08-14T22:55:21Z
dc.date.available2024-08-14T22:55:21Z
dc.date.copyright1980en_US
dc.date.issued1980
dc.degree.departmentDepartment of Mathematics
dc.degree.departmentDepartment of Mathematics and Statistics
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractThis thesis studies two common problems faced by computer analysts. The first is data compaction; often this is required for economic reasons or to make best use of scarce external storage and associated interfaces. The second problem is that of protecting data which has been obtained by unauthorized persons from exposure, by cyphering or en­cryption. This exposure can be accidental, such as a computer tape being lost, or a deliberate interception of a cyphered transmission. The basic aim of this thesis is to examine the interrelation between compaction and security cyphering. While a connection appears probable little work has been done on this subject. A number of data compaction techniques are evaluated and it is shown that data compaction is justified on modern computer systems. Theoretical limits to data compaction are given and, generally lower, practical limits are discussed. The effect of data compaction on cypher security is demonstrated theoretically. Several modern computer cypher techniques are reviewed; data compaction is shown to be required to increase their security. Some weaknesses in modern computer security are reviewed and methods are given to increase this security. Methods of compacting computer data prior to encryption are given. Computer Programs are supplied in the appendices for security encryption.en_US
dc.format.extent143 pages
dc.identifier.urihttps://hdl.handle.net/1828/19083
dc.rightsAvailable to the World Wide Weben_US
dc.titleData security and compaction techniquesen_US
dc.typeThesisen_US

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