A PROPOSED SECURITY MODEL FOR MAP INFORMATION SYSTEM

Abstract

There is increasing growth in the number of users that need map data for various purposes. This increase together with concern about privacy, security and integrity of information exchange has created considerable.._ interest in the use of a security system. A security system protects data using cryptographic techniques in such a way that unauthorised decoding of data is impossible (at least, within a time interval where the data would be of value to an interceptor). Cryptography can be used to hide the actual contents of some sensitive parts through some method of transformations. In conventional cryptographic systems, as same key is used for encryption and decryption, key distribution becomes a weak link. A relatively recent development in the field of cryptography is an encryption system which does not require total key secrecy. This approach, called public key cryptography employs different keys for encrypting and decrypting data. In the present work, trapdoor knapsack algorithm based on public key cryptography has been implemented which makes the cipher data much harder to be broken by, an intruder. To provide multilevel data protection facility users are categorised into three classes public, restricted and secret. Each item of information is also assigned a classification chosen from these classes. No individual can see information above his level. Only the manager can manage different files, other users can only access data according to their hierarchical level. The proposed security model takes into account a single map but it can be easily enhanced to work for more than one map;.