Abstract:In spite of ali existing security mechanisms, it is quite difficult to protect databases from electronic attacks. This research provides techniques to make an assessment of the damaged data and then to recover the affected data to consistent states after an attack is detected. Damage assessment is done using data dependency approach in order to obtain precise information on the damaged part of the database. Two algorithms are presented in this paper. The first algorithm performs the damage assessment and recovery simultaneouslYj whereas the second algorithm separates these two processes for improved efficiency. Both algorithms allow blind-writes on data items allowing damaged items to be recovered automatically.
INTRODUCTIONWith the increasing popularity of Internet, worldwide information sharing becomes a common practice. At the same time, this connectivity with the rest of the world opens channels for intruders to access and possibly damage sensitive information. Although there are severa! techniques available, as described in [1] and [4], to prevent unauthorized access to sensitive data, these preventive measures are not always successful. It seems extremely hard to build systems that share information over electronic networks and still remain invulnerable to attackers. Hackers are always in search of new ways to prevail over the system security. Password sniffing and session hijackings are among various other means of intruding into a system, and the system will not be able to detect an attacker from a legitimate user in these cases. Besides, there remains possibility of significant damage by insider-turn-foes.S. Jajodia (ed.), Database Security XII
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