Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Masriyan/Claude-Code-CyberSecurity-Skill --skill 13-crypto-analysisgit clone --depth 1 https://github.com/Masriyan/Claude-Code-CyberSecurity-SkillWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/masriyan/claude-code-cybersecurity-skill/13-crypto-analysis)<a href="https://agentmods.dev/skills/masriyan/claude-code-cybersecurity-skill/13-crypto-analysis"><img src="https://agentmods.dev/badge/skills/masriyan/claude-code-cybersecurity-skill/13-crypto-analysis.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Tool Misuse · line 229 Tool defaults are unsafe or overly permissive (e.g. disabled TLS verification, no authentication, world-writable permissions). Unsafe defaults widen the attack surface.Fix: Override unsafe defaults with secure settings (verify=True, auth required, restrictive permissions). Review and harden all tool configurations.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00030 | $0.04090 |
| Opus 5 | $0.00015 | $0.02045 |
| Sonnet 5 | $0.00006 | $0.00818 |
| Haiku 4.5 | $0.00003 | $0.00409 |
Grade A, and why
Cryptographic Analysis & Assessment scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
requests.get(url, verify=False) # ← Never do this in production How it starts
The opening of the file, as written. The whole thing — 372 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cryptographic Analysis & Assessment
Purpose
Enable Claude to assist with cryptographic security assessments including SSL/TLS configuration auditing, cipher suite analysis and recommendation, hash algorithm identification, encryption implementation code review, key management evaluation, and detection of cryptographic vulnerabilities. Claude directly analyzes provided configurations and code.
Activation Triggers
This skill activates when the user asks about:
- Auditing SSL/TLS configuration of a server or service
- Evaluating cipher suites for security strength
- Identifying hash algorithms from hash values or code
- Reviewing code for cryptographic implementation flaws
- Assessing key lengths, key management, or rotation policies
- Detecting hardcoded keys, weak IVs, or ECB mode usage
- Generating TLS configuration recommendations (Mozilla profile)
- Certificate analysis (expiration, chain, transparency)
- Post-quantum cryptography guidance
- Password hashing implementation review (bcrypt, Argon2, PBKDF2)
Prerequisites
pip install cryptography requests pyOpenSSL
Recommended tools:
sslyze— Python TLS scannertestssl.sh— Comprehensive TLS testingopenssl— Command-line TLS operationsWireshark— TLS traffic analysiscertbot— Certificate management
Core Capabilities
1. SSL/TLS Configuration Auditing
When the user asks to audit TLS for a server or paste a TLS configuration:
Command-line audit approach:
# Quick TLS check using openssl
openssl s_client -connect example.com:443 -tls1_2 2>/dev/null | grep -E "Protocol|Cipher"
openssl s_client -connect example.com:443 -tls1 2>/dev/null | grep -E "handshake|error"
# Check certificate details
openssl s_client -connect example.com:443 </dev/null 2>/dev/null | openssl x509 -noout -dates -subject -issuer
# Comprehensive scan with sslyze
sslyze --regular example.com --json_out result.json
# Or testssl.sh (most comprehensive)
./testssl.sh --severity HIGH --quiet example.com
# Use the skill's script
python scripts/tls_auditor.py --host example.com --port 443 --output report.json
python scripts/tls_auditor.py --host mail.example.com --port 993 --grade
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 372 lines · 30 tokens per session scan A 6bffb708e2ed
Cryptographic Analysis & Assessment is a skill published in the GitHub repository Masriyan/Claude-Code-CyberSecurity-Skill (399 stars, last pushed 4d ago), licensed MIT. It adds 30 tokens to every session and 4,090 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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