finding-crypto-misuse SKILL.md skillA
finding-crypto-misuse from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/finding-crypto-misuse@git:20260816.e670f56Pins git:20260816.e670f56 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/finding-crypto-misuse/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260816.e670f56, committed Aug 16, 2026
- Size
- 6,452 bytes
- Repository stars
- 26
- License
- MIT
Find exploitable cryptographic misuse, not theoretical weakness: reused nonces (stream and counter/GCM keystream reuse, ECDSA private-key recovery from a repeated per-signature secret), padding oracles that decrypt ciphertext, hash length-extension on naive MAC constructions, predictable or reused IVs and keys, and a hash chosen for the wrong job. Use when reviewing code that encrypts, signs, authenticates, or hashes, or when a protocol rolls its own crypto. The finding is a concrete recovery…
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
# Finding crypto misuse: the finding is a recovery, not a weak primitive Most crypto findings that matter are not "the algorithm is broken"; they are the algorithm used wrong in a way that hands you plaintext, a key, or a forgery. A cipher is only as safe as its nonce discipline, a signature only as safe as its randomness, a MAC only as safe as its construction. Finding crypto misuse means looking for the specific misuse patterns that collapse to a concrete attack, and proving the attack rather than flagging the primitive. ## When to use - You are reviewing code that encrypts, decrypts, signs, verifies, MACs, or hashes. - A protocol or service rolls its own crypto or composes primitives by hand. - You need to separate an exploitable misuse from a cosmetic "weak crypto" alert. ## Scope check Analyze crypto in code you own or are authorized to test. Demonstrate recovery or forgery only against your own keys and data. If you can't name the authorization, stop. ## The loop 1. **Inventory the crypto operations and their inputs.** List every place the code encrypts, decrypts, signs, verifies, MACs, or hashes, and for each capture the …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/finding-crypto-misuse@sha256:0d364ff8cf4d7fa0The line at the top of this page pins the label git:20260816.e670f56, 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_v2rwy7oubtlnr67y)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 16, 2026.
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 (6452 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
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_v2rwy7oubtlnr67y GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/finding-crypto-misuse GET https://markdownregistry.com/api/v1/blob/0d364ff8cf4d7fa0373c2d785f5838475f36846e548724aa3a65212ab81d05a2
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.