A technique to search log records using system of linear equations

Growth of network technology and easy internet access are the key features for development and use of Database-as-a-Service (DaaS) technique. In DaaS technique it is necessary to ensure safe and correct operation of any industry. In many cases, the types of data records used to conduct security audits are considered sensitive, as they could reveal information about internal network structures, the types of software running, private customer or employee information. In this paper we suggest a technique based on system of linear equations, which enables a trusted party to give the service provider´s server the ability to test whether a given keyword appears in log records but the server learns nothing about the keyword and the log content. We compare our scheme with existing encryption schemes and prove that our scheme is efficient and secure.