crypto-analysis SKILL.md skillA
crypto-analysis from hypnguyen1209/offensive-claude is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hypnguyen1209/offensive-claude/crypto-analysis@git:20260629.9f4a1a5Pins git:20260629.9f4a1a5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hypnguyen1209/offensive-claude
- Path
skills/crypto-analysis/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260629.9f4a1a5, committed Jun 29, 2026
- First version recorded
- May 19, 2026
- Size
- 8,756 bytes
- Repository stars
- 405
- License
- MIT
Use when assessing cryptography — TLS/PKI auditing, RSA/ECC key attacks, ECDSA nonce lattice recovery, symmetric/AEAD misuse, JWT/JOSE forgery, hash cracking, post-quantum migration review.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cryptographic Analysis
## When to Activate
- Auditing TLS/SSL/SSH configurations and X.509 PKI (cipher suites, downgrade, protocol flaws)
- Reviewing crypto implementations in source code or captured traffic
- Attacking weak RSA/ECC keys (CTF and real-world weak-key hygiene)
- Recovering ECDSA/DSA private keys from reused or biased nonces (lattice/HNP)
- Exploiting symmetric/AEAD misuse: padding oracles, GCM nonce reuse, key-commitment
- Forging JWT/JOSE tokens (algorithm confusion, none, jwk/jku/kid injection)
- Cracking password hashes and grading KDF strength
- Assessing post-quantum readiness ("harvest now, decrypt later" exposure)
## Technique Map
| Technique | ATT&CK | CWE | Reference | Script |
|-----------|--------|-----|-----------|--------|
| TLS cipher/protocol downgrade audit | T1600.001 | CWE-326 | references/tls-pki-audit.md | scripts/tls_audit.py |
| Terrapin SSH prefix truncation (CVE-2023-48795) | T1557 | CWE-222 | references/tls-pki-audit.md | scripts/tls_audit.py |
| Marvin/Bleichenbacher RSA timing oracle | T1600 | CWE-208 | references/tls-pki-audit.md | scripts/tls_audit.py |
…Read the whole file at its exact version.
How to install
mdr add hypnguyen1209/offensive-claude/crypto-analysis@sha256:4fdb7bfc9cc01916The line at the top of this page pins the label git:20260629.9f4a1a5, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_hzqdqx7hl35ff6vt)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between May 19, 2026 and Jun 29, 2026, about one every 10 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260629.9f4a1a5 latest | 2026-06-29 | 9f4a1a5 | 8,756 B | A | view · diff |
| git:20260628.d1cc1ce | 2026-06-28 | d1cc1ce | 8,753 B | A | view · diff |
| git:20260528.c57f98d | 2026-05-28 | c57f98d | 14,678 B | A | view · diff |
| git:20260528.6136b32 | 2026-05-28 | 6136b32 | 5,905 B | A | view · diff |
| git:20260519.5ae9faf | 2026-05-19 | 5ae9faf | 5,650 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (8756 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
hypnguyen1209/offensive-claude · 405 stars · license MIT · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hzqdqx7hl35ff6vt GET https://markdownregistry.com/api/v1/resolve?ref=hypnguyen1209/offensive-claude/crypto-analysis GET https://markdownregistry.com/api/v1/blob/4fdb7bfc9cc019169ed4eca753d8768a691e50859b4c1265d7aea759dcb9880d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.