Selecting One OpenSSL Version for the Security Code

### What

This task is a child of #30 .

The task focuses on identifying only one OpenSSL version to be used in the SCORE security code.

### Acceptance Criteria (DoD)

- Document explaining the choice of the selected OpenSSL version.
- Code and build files are updated to use the selected OpenSSL version.
- All tests are succeeding after the updates.
- A PR is created to merge to the main branch.

### How

_No response_

Start with parent issue #30, then inspect the repository's C++ security code and build files to identify the OpenSSL versions currently in use and the available test commands. Compare the candidate version choices and document the selected version. Done means the documentation, code, and build files consistently use one version and all tests pass.

Written by the indexing model from the issue text.