Privacy preservation and enhanced utility in search log publishing using improved zealous algorithm

Search log records can enhance the quality and delivery of internet information services to the end user. Analysing and exploring the search log can explore the user´s behaviour. When these search logs are published it must ensure privacy of the users at the same time it should exhibit better utility. The existing ZEALOUS algorithm uses a two threshold framework to provide probabilistic differential privacy. In the course of providing this level of privacy the search log looses it´s utility, as it publishes only frequent items. So an algorithm is proposed to enhance the utility of search log by qualifying the infrequent items while publishing at the same time preserving the stronger level of privacy.