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Configuring TLS 1.3 Securely

Guides setting up and auditing TLS 1.3 encryption on web servers, with connection testing scripts.

Source Download skill
Repository
mukul975/Anthropic-Cybersecurity-Skills
Stars
35,430
Licence
Apache-2.0
Files
7 files

What it does

TLS is the encryption that puts the padlock on websites and protects data sent between apps and servers. With this skill installed, the agent follows a structured checklist for turning on the newest version, TLS 1.3, on servers such as nginx, Apache, or Python apps. It helps choose strong cipher suites and key-exchange groups, turn off old versions like TLS 1.0 and 1.1, and check the result with standard tools like openssl and testssl.sh. It also includes Python scripts that connect to a server to report which TLS versions and ciphers it accepts and can generate sample configuration files.

Great for

  • Engineers hardening a web server or API endpoint who want a repeatable TLS 1.3 checklist
  • Security staff auditing a server they own or are authorized to test for weak TLS settings
  • Students learning how TLS 1.3 differs from TLS 1.2 and how to verify it

Skip it if

  • Testing servers you do not own or have written permission to scan, since the scripts actively connect and probe them
  • Replacing expert review for production compliance, because the skill gives general guidance and its scripts may not match every server setup
  • Non-technical users who need a finished, ready-to-deploy configuration without reviewing it, since mistakes can break HTTPS for all visitors

Try asking

  • “Check which TLS versions and cipher suites example.com accepts on port 443”
  • “Write an nginx configuration that enables TLS 1.3 and disables TLS 1.0 and 1.1”
  • “Explain how TLS 1.3 handshakes differ from TLS 1.2 and what 0-RTT risks exist”
  • “Create a validation checklist for my server before we go live”
Step-by-step guide: how to use Configuring TLS 1.3 SecurelyInstall, first run, examples, tips and FAQs

Install in 3 steps

  1. 1

    Download the skill

    The ZIP contains the 7 original files, the Apache-2.0 licence and an attribution note.

    configuring-tls-1-3-for-secure-communications.zip
  2. 2

    Add it to your agent

    Claude Code (all projects)

    mkdir -p ~/.claude/skills && unzip configuring-tls-1-3-for-secure-communications.zip -d ~/.claude/skills/

    Claude Code / Agent SDK (this project only)

    mkdir -p .claude/skills && unzip configuring-tls-1-3-for-secure-communications.zip -d .claude/skills/

    Claude apps (web/desktop): Settings → Capabilities → Skills → Upload skill, and choose the ZIP.

  3. 3

    Ask for the task

    No special command needed — the agent reads the skill's description and loads it when your request matches. Try one of the prompts above.

Get better results

  • Only point the scripts at servers you own or are authorized to test, and start with a lab or staging environment.
  • Review any generated nginx or Apache configuration and certificate-generation commands before applying them to a live server.
  • Ask the agent to explain each cipher suite and group choice so you understand the trade-offs for your compatibility needs.

What's inside

  • assets/template.md
  • references/api-reference.md
  • references/standards.md
  • references/workflows.md
  • scripts/agent.py
  • scripts/process.py
  • SKILL.md

Redistributed unmodified from mukul975/Anthropic-Cybersecurity-Skills under the Apache-2.0 licence. The assessment was drafted with AI from the skill's files on 2026-10-29. Skills can instruct your agent to run code — read SKILL.md and any scripts before installing.