Variable encryption techniques for secure and efficient searchable encryption

Abstract

Disclosed embodiments relate to dynamically changing an encryption technique for encrypted data to be stored in a searchable database. Operations may include receiving encrypted data for storage in the searchable database, the encrypted data having been encrypted by a client using a cryptographic key based on an encryption alteration scheme; receiving a search query from the client, the search query comprising a plurality of search strings including at least: an encrypted version of a plaintext string that was encrypted by the client using the cryptographic key, and one or more encrypted versions of the plaintext string that were encrypted by the client using one or more other cryptographic keys; processing the search query; and returning a response to the search query to the client.