The gap standard encryption does not close
Standard encryption protects data when it is stored on disk or sent over a network. But to process a search query, a server must decrypt the data into memory first. This means that anyone with access to the server, including cloud infrastructure providers, system administrators, or an attacker who has compromised the server, can read the actual content of your data while the search is running.
For many businesses this is acceptable, but for industries that handle the most sensitive information, it is not. Medical records, genomic data, financial transaction histories, classified government intelligence, and behavioral profiles all require a higher standard: the server should never see the actual data, even while processing it.
How queryable encryption works
Queryable encryption allows the server to run similarity searches over data that remains encrypted throughout the entire process, including at rest, in transit, and during the search computation itself. The encryption and decryption happen only on the user's device. The server that stores and searches the data holds only scrambled ciphertext and never possesses the key to unscramble it.
Practical implementations use several different technologies. Secure enclaves (such as Intel SGX and AMD SEV) are specially isolated regions of a processor where even the host operating system cannot read the memory, allowing sensitive computations to run inside an encrypted container. Structured encryption uses mathematical protocols that preserve the ordering relationships needed for similarity search while keeping the actual values hidden.
Who needs queryable encryption
Queryable encryption is essential for organizations that need AI capabilities on data they are not allowed to expose to any third party. This includes hospitals analyzing patient records (HIPAA compliance), banks and insurers processing behavioral data (GDPR and financial regulations), government agencies running intelligence analysis on classified documents, and any company that has made contractual commitments to customers that their data will never be visible to infrastructure operators.
Endee Enterprise includes queryable encryption as a production-ready feature, allowing these organizations to run vector search over sensitive data without compromising their security obligations.