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cdxgen/cdxgen
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Agent skill
Configuring Tls 1 3 For Secure Communications
Configures TLS 1.3 (RFC 8446) on servers, covering cipher suite and key-exchange group selection, and validates the resulting configuration with openssl sclient and testssl.sh.
Install Configuring Tls 1 3 For Secure Communications
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills configuring-tls-1-3-for-secure-communications --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/configuring-tls-1-3-for-secure-communications .claude/skills/configuring-tls-1-3-for-secure-communications && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "configuring-tls-1-3-for-secure-communications" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communications into .claude/skills/configuring-tls-1-3-for-secure-communications/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "configuring-tls-1-3-for-secure-communications", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communicationsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills configuring-tls-1-3-for-secure-communications --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/configuring-tls-1-3-for-secure-communications .agents/skills/configuring-tls-1-3-for-secure-communications && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "configuring-tls-1-3-for-secure-communications" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communications into .agents/skills/configuring-tls-1-3-for-secure-communications/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "configuring-tls-1-3-for-secure-communications", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills configuring-tls-1-3-for-secure-communications --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/configuring-tls-1-3-for-secure-communications .cursor/skills/configuring-tls-1-3-for-secure-communications && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "configuring-tls-1-3-for-secure-communications" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communications into .cursor/skills/configuring-tls-1-3-for-secure-communications/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "configuring-tls-1-3-for-secure-communications", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git --path skills/configuring-tls-1-3-for-secure-communications--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills configuring-tls-1-3-for-secure-communications --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/configuring-tls-1-3-for-secure-communications .gemini/skills/configuring-tls-1-3-for-secure-communications && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "configuring-tls-1-3-for-secure-communications" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communications into .gemini/skills/configuring-tls-1-3-for-secure-communications/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "configuring-tls-1-3-for-secure-communications", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills configuring-tls-1-3-for-secure-communicationsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/configuring-tls-1-3-for-secure-communications .github/skills/configuring-tls-1-3-for-secure-communications && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "configuring-tls-1-3-for-secure-communications" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communications into .github/skills/configuring-tls-1-3-for-secure-communications/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "configuring-tls-1-3-for-secure-communications", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills configuring-tls-1-3-for-secure-communications --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/configuring-tls-1-3-for-secure-communications .opencode/skills/configuring-tls-1-3-for-secure-communications && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "configuring-tls-1-3-for-secure-communications" agent skill from https://github.com/mukul975/Anthropic-Cybersecurity-Skills/tree/main/skills/configuring-tls-1-3-for-secure-communications into .opencode/skills/configuring-tls-1-3-for-secure-communications/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "configuring-tls-1-3-for-secure-communications", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
configuring-tls-1-3-for-secure-communications- GitHub stars
- 34k
- Token cost
- ~1.1k tokens
- SKILL.md length
- 459 words
- Files
- 8 (incl. scripts, references, assets)
- Skills in repo
- 644
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Configures TLS 1.3 (RFC 8446) on servers, covering cipher suite and key-exchange group selection, and validates the resulting configuration with openssl sclient and testssl.sh.
- Works in 8 steps: Verify OpenSSL version supports TLS 1.3… → Generate or obtain TLS certificate and… → Configure server to use TLS 1.3 cipher… → …
- Hardening TLS 1.3 for secure communications
- SKILL.md covers Overview, When to Use, Prerequisites and Objectives, plus 4 more sections
- Runs Python scripts from its folder
What it does
Configuring Tls 1 3 For Secure Communications is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configures TLS 1.3 (RFC 8446) on servers, covering cipher suite and key-exchange group selection, and validates the resulting configuration with openssl sclient and testssl.sh. Use when deploying or hardening TLS 1.3 for secure communications, or when testing a server for common TLS misconfigurations and vulnerabilities.
Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).
It sits in Security, covering Cryptography. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.
When your agent uses it
- Hardening TLS 1.3 for secure communications
- Testing a server for common TLS misconfigurations and vulnerabilities
Example prompts
- “Use the configuring-tls-1-3-for-secure-communications skill to configure TLS 1.3 (RFC 8446) on servers, covering cipher suite and key-exchange group…”
- “/configuring-tls-1-3-for-secure-communications”
Requirements
- Python 3
Workflow steps
8 steps, taken from the first numbered list in SKILL.md.
- Verify OpenSSL version supports TLS 1.3 (1.1.1+)
- Generate or obtain TLS certificate and private key
- Configure server to use TLS 1.3 cipher suites
- Disable TLS 1.0 and 1.1 (optionally keep 1.2 for compatibility)
- Set preferred key exchange groups
- Enable OCSP stapling for certificate validation
- Test configuration with openssl s_client and testssl.sh
- Configure HSTS header for HTTP Strict Transport Security
What it can do on your machine
Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 2 files in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Configuring Tls 1 3 For Secure Communications loads about 1.1k tokens when it runs, and up to ~2.7k if it reads all its reference files. Until then it costs about 92 tokens; SKILL.md has 459 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 459 words, ~1,085 tokens.
Download SKILL.mdSave it as
.claude/skills/configuring-tls-1-3-for-secure-communications/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.- name
- configuring-tls-1-3-for-secure-communications
- description
- Configures TLS 1.3 (RFC 8446) on servers, covering cipher suite and key-exchange group selection, and validates the resulting configuration with openssl s_client and testssl.sh. Use when deploying or hardening TLS 1.3 for secure communications, or when testing a server for common TLS misconfigurations and vulnerabilities.
- domain
- cybersecurity
- subdomain
- cryptography
- tags
- cryptography, tls, ssl, transport-security, network-security
- version
- 1.0
- author
- mahipal
- license
- Apache-2.0
- nist_csf
- PR.DS-01, PR.DS-02, PR.DS-10
- mitre_attack
- T1557, T1040, T1573.002, T1539, T1556.004
Configuring TLS 1.3 for Secure Communications
Overview
TLS 1.3 (RFC 8446) is the latest version of the Transport Layer Security protocol, providing significant improvements over TLS 1.2 in both security and performance. It reduces handshake latency to 1-RTT (and 0-RTT for resumed sessions), removes obsolete cipher suites, and mandates perfect forward secrecy. This skill covers configuring TLS 1.3 on servers, validating configurations, and testing for common misconfigurations.
When to Use
- When deploying or configuring configuring tls 1 3 for secure communications capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
Prerequisites
- Familiarity with cryptography concepts and tools
- Access to a test or lab environment for safe execution
- Python 3.8+ with required dependencies installed
- Appropriate authorization for any testing activities
Objectives
- Configure TLS 1.3 on nginx and Apache web servers
- Implement TLS 1.3 in Python applications using the ssl module
- Validate TLS configurations with openssl and testssl.sh
- Understand TLS 1.3 cipher suites and key exchange mechanisms
- Configure 0-RTT early data with appropriate protections
- Disable legacy TLS versions (1.0, 1.1) and weak cipher suites
Key Concepts
TLS 1.3 Cipher Suites
| Cipher Suite | Key Exchange | Authentication | Encryption | Hash |
|---|---|---|---|---|
| TLS_AES_256_GCM_SHA384 | ECDHE/DHE | Certificate | AES-256-GCM | SHA-384 |
| TLS_AES_128_GCM_SHA256 | ECDHE/DHE | Certificate | AES-128-GCM | SHA-256 |
| TLS_CHACHA20_POLY1305_SHA256 | ECDHE/DHE | Certificate | ChaCha20-Poly1305 | SHA-256 |
TLS 1.3 vs 1.2 Improvements
- 1-RTT Handshake: Full handshake completes in one round trip (vs 2 in TLS 1.2)
- 0-RTT Resumption: Resumed connections can send data immediately
- No RSA Key Exchange: Only ephemeral Diffie-Hellman (mandatory PFS)
- Simplified Cipher Suites: Removed CBC, RC4, 3DES, static RSA, SHA-1
- Encrypted Handshake: Server certificate is encrypted after ServerHello
Show full SKILL.md (185 more words)Show less
Key Exchange Groups
- x25519: Curve25519 ECDH (preferred, fast)
- secp256r1: NIST P-256 ECDH (widely supported)
- secp384r1: NIST P-384 ECDH (higher security margin)
- x448: Curve448 ECDH (highest security)
Workflow
- Verify OpenSSL version supports TLS 1.3 (1.1.1+)
- Generate or obtain TLS certificate and private key
- Configure server to use TLS 1.3 cipher suites
- Disable TLS 1.0 and 1.1 (optionally keep 1.2 for compatibility)
- Set preferred key exchange groups
- Enable OCSP stapling for certificate validation
- Test configuration with openssl s_client and testssl.sh
- Configure HSTS header for HTTP Strict Transport Security
Security Considerations
- 0-RTT data is vulnerable to replay attacks; limit to idempotent requests
- Always include TLS 1.2 fallback if legacy client support is required
- Use ECDSA certificates for better performance (vs RSA)
- Enable OCSP stapling to improve client certificate validation
- Set HSTS header with long max-age and includeSubDomains
- Monitor for certificate transparency logs
Validation Criteria
- TLS 1.3 handshake completes successfully
- Only approved cipher suites are offered
- Perfect forward secrecy is enforced
- TLS 1.0 and 1.1 are rejected
- OCSP stapling is functional
- Certificate chain is valid and complete
- testssl.sh reports no vulnerabilities
© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 7 other files (scripts, references, assets) in skills/configuring-tls-1-3-for-secure-communications of mukul975/Anthropic-Cybersecurity-Skills.
- SKILL.md
- LICENSE
- assets/template.md
- references/api-reference.md
- references/standards.md
- references/workflows.md
- scripts/agent.py
- scripts/process.py
Open the folder on GitHubat commit 54a7988
Compare with similar skills
Configuring Tls 1 3 For Secure Communications next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Configuring Tls 1 3 For Secure Communications this skillmukul975/Anthropic-Cybersecurity-Skills | 34k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Bom Explorecdxgen/cdxgen | 1.1k | — | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Crypto Analysishypnguyen1209/offensive-claude | 388 | — | ~2.2k | Automated safety check: Pass | MIT | |
| Security Reviewvalory-xyz/open-autonomy | 129 | — | ~11k | Automated safety check: Notes | Apache-2.0 | |
| Hashcat Password Recovery WorkflowAgentSecOps/SecOpsAgentKit | 220 | 1 repos | ~3.3k | Automated safety check: Notes | Custom licence | |
| Altllm Portal Authinternet-court/internet-court-skill | 6.6k | 1 repos | ~632 | Automated safety check: Pass | ISC |
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Related
Categories
Questions about Configuring Tls 1 3 For Secure Communications
What does Configuring Tls 1 3 For Secure Communications do?
Configures TLS 1.3 (RFC 8446) on servers, covering cipher suite and key-exchange group selection, and validates the resulting configuration with openssl sclient and testssl.sh. Configuring Tls 1 3 For Secure Communications is an agent skill from mukul975/Anthropic-Cybersecurity-Skills.sh.
When should I use Configuring Tls 1 3 For Secure Communications?
Configuring Tls 1 3 For Secure Communications fits situations like: hardening TLS 1.3 for secure communications; testing a server for common TLS misconfigurations and vulnerabilities.
How do I install Configuring Tls 1 3 For Secure Communications in Claude Code?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a claude-code`. Or copy the skill folder (skills/configuring-tls-1-3-for-secure-communications in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/configuring-tls-1-3-for-secure-communications in your project. Claude Code loads it when a task matches its description.
How do I install Configuring Tls 1 3 For Secure Communications in Codex?
Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a codex`. Or copy the skill folder (skills/configuring-tls-1-3-for-secure-communications in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/configuring-tls-1-3-for-secure-communications in your project. Codex loads it when a task matches its description.
Can I use Configuring Tls 1 3 For Secure Communications in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill configuring-tls-1-3-for-secure-communications -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/configuring-tls-1-3-for-secure-communications, .gemini/skills/configuring-tls-1-3-for-secure-communications, .github/skills/configuring-tls-1-3-for-secure-communications and .opencode/skills/configuring-tls-1-3-for-secure-communications in your project.
What does Configuring Tls 1 3 For Secure Communications need to run?
Going by SKILL.md and its folder, Configuring Tls 1 3 For Secure Communications needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Configuring Tls 1 3 For Secure Communications access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Configuring Tls 1 3 For Secure Communications safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Configuring Tls 1 3 For Secure Communications use?
Configuring Tls 1 3 For Secure Communications is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Configuring Tls 1 3 For Secure Communications use?
About 1.1k tokens (SKILL.md is roughly 4.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.6k tokens, read only when the agent opens those files.
What are the alternatives to Configuring Tls 1 3 For Secure Communications?
Skills that share tags, products or a category with Configuring Tls 1 3 For Secure Communications: Bom Explore (cdxgen/cdxgen, 1.1k stars), Crypto Analysis (hypnguyen1209/offensive-claude, 388 stars), Security Review (valory-xyz/open-autonomy, 129 stars) and Hashcat Password Recovery Workflow (AgentSecOps/SecOpsAgentKit, 220 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Configuring Tls 1 3 For Secure Communications?
mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.
Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.