Add rate limiting for pagination

**Description**
Currently services lacks proper encryption support.

**Proposed solution**
Add configurable encryption with sensible defaults.

**Priority**: Low/Medium

The title asks for pagination rate limiting, while the description and proposed solution ask for configurable encryption, so the intended scope is unresolved. No files, tests, or entry points are named; first confirm the intended change with maintainers and define completion criteria for the selected feature.

Written by the indexing model from the issue text.