Cloaked Search is a transparent proxy for Elasticsearch that protects sensitive data in the Elasticsearch index and document store to protect it from hackers, curious administrators, and other threats.
You can decide which fields in a document are sensitive, and the proxy will apply cryptographic techniques to cloak any index terms generated from those fields. This protects the data in those fields from being extracted from the index. It also processes all queries and cloaks the search terms, so an eavesdropper can’t make guesses about the documents by watching the query traffic. The proxy also encrypts the full document. Put it all together, and Cloaked Search lets you do full text searches on encrypted data.
Cloaked Search’s API is the same as the underlying Elasticsearch API, so all requests intended for Elasticsearch should flow through the proxy. The proxy will only modify requests that involve fields that have been configured for protection. For those fields, the data will be encrypted before being passed on to Elasticsearch.
Cloaked Search can be configured for a multi-tenant environment where separate keys are used for each tenant’s data. When combined with SaaS Shield, tenants may manage their own encryption keys to take control of their data. The multi-tenant feature also reduces the possibility of accidental information leakage and cross-tenant data pollution.

What Types Of Fields Does Cloaked Search Support?

Cloaked Search works best on text fields like titles, abstracts, names, and addresses. Other field types, like numbers and dates, cannot be encrypted at this time unless they are treated as strings. If encrypted, range matches (eg, values greater than x) will not work.

What Queries Are Supported?

Cloaked Search supports a commonly used subset of Elasticsearch’s query string syntax. Queries can contain an arbitrary number of terms combined using AND/OR. Specific fields to be searched must be specified and can be annotated using +field:term/-field:term for “must contain” and “must not contain” terms. A query can contain a mix of protected fields and standard fields.

Preview Release and Limitations

The preview release of Cloaked Search allows you to try it out with a single master key. Per-tenant keys are derived from that key. Features coming soon and expected before the initial release:
  • SaaS Shield integration;
  • improved results on large text fields by taking frequency and rough word position into account;
  • broadened query support as we learn more about usage through the preview;
  • fuzzy matching with a phonetic matcher;
  • substring matches for prefix and suffix wildcards;
  • security configuration tuning per-field and per-index;
  • boosting;
  • phrase queries;
  • and support for other query APIs.
In the meantime, you should be able to test locally using large datasets and multiple tenants. You can configure encryption for just certain fields, make queries using the simple query string JSON format, and pass through non-index/query requests.

Getting Started and Learning More

You can try out Cloaked Search in about 5 Minutes. All you need is a basic *nix installation and docker to run it locally.
If you'd like to understand how Cloaked Search secures your data, check out What Is Encrypted Search.