Adds recap of basic crypto

[dbosk]

Adds a short recap of basic crypto for the tilkry20 course.

[dbosk]

Status Review (January 2026)

Branch state: 117 commits behind master, last activity March 2020.

What's done:

• New tilkry-overview/ module with 339 lines:
  • Complete slide infrastructure (slides.tex, preamble.tex, Makefile)
  • Content importing from one-way/, pub-key/, and zkp-smc/ modules
  • 37 lines of original content in contents.tex
• Minor modifications to one-way/, pub-key/, and zkp-smc/ to support imports
• Question recipes in Makefile

Assessment:

This PR is ~5 years old and was created for the tilkry20 course iteration. Since then:

• A course-overview branch was merged (PR Add course overview #87, 2024)
• The intro/ module has been updated
• Course structure may have evolved

What's missing:

• Review whether this content overlaps with or is superseded by current overview materials
• 117 commits of divergence will likely cause conflicts in one-way/, pub-key/, zkp-smc/

Recommendation:

Evaluate whether this "recap of basic crypto" is:

1. Already covered by existing intro/overview content → close PR
2. Still needed as a separate quick review → rebase and update
3. Useful content to extract and integrate elsewhere → cherry-pick relevant parts

The module structure is sound but may need significant updates to work with current codebase.