Add rate limiting for encryption

**Problem**
When working with core, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the core encryption path and its existing error handling, since the issue does not name files or tests. Clarify whether the intended work is rate limiting, more descriptive errors, or both; done should be defined by the agreed behavior and corresponding verification.

Written by the indexing model from the issue text.