Forward Secure Public Key Encryption with Keyword Search for Outsourced Cloud Storage


Cloud storage has become a primary industry in remote data management services, but it also attracts security concerns. Encryption is the best available approach for preventing data disclosure in this context because it prevents data from being read by unauthorized parties. Among these, the public key encryption with keyword search, also known as PKSE, is regarded as a potentially useful method due to the fact that clients are able to search through encrypted data files with relative ease. In other words, before a client can query data files, the client must first generate a search token. The cloud server then makes use of the search token to continue the query over the encrypted data files. However, a dangerous vulnerability is exposed whenever PKSE is combined with cloud. Formally speaking, the cloud server is able to learn the information of a newly added encrypted data file if the file contains the keyword that was previously queried by using the search tokens that it has received, and it is further able to discover the privacy information. We propose a forward secure public key searchable encryption scheme as a solution to this problem. According to this scheme, a cloud server is unable to discover any information regarding a newly added encrypted data file that contains the keyword that was previously queried. We present a framework for constructing forward secure public key searchable encryption schemes that is based on attribute-based searchable encryption in order to help the reader gain a better understanding of the design principle. In conclusion, the results of the experiments demonstrate that our plan is effective.

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