miosa-osa/osa · priv/skills/offensive-crypto-attacks/SKILL.md

offensive-crypto-attacks skillA

offensive-crypto-attacks is agent-read markdown (skill) from miosa-osa/osa: Systematic methodology for identifying and exploiting cryptographic implementation weaknesses in real-world applications. Covers padding oracle attacks against CBC-mode ciphers with PKCS7 padding (Vaudenay's original attack through modern padbuster automation), ECB mode exploitation including block cut-and-paste and byte-at-a-time decryption, hash length extension attacks against SHA1/SHA256/MD5-based MACs using HashPump, RSA vulnerabilities including small public exponent, common modulus, Bleic.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add miosa-osa/osa/offensive-crypto-attacks@git:20260913.e13b6b8
Exact content
mdr add miosa-osa/osa/offensive-crypto-attacks@sha256:75a69d2a1e489083

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_uj6uw3clgnvfnsxf.svg)](https://markdownregistry.com/a/art_uj6uw3clgnvfnsxf)

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Versions

versioncommittedcommitsizeaudit
git:20260913.e13b6b8 latest2026-09-13 e13b6b8 21,260 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (21260 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

GitHub

miosa-osa/osa · 57 stars · license NOASSERTION · pushed 2026-09-14 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_uj6uw3clgnvfnsxf
GET https://markdownregistry.com/api/v1/resolve?ref=miosa-osa/osa/offensive-crypto-attacks
GET https://markdownregistry.com/api/v1/blob/75a69d2a1e489083d90215759bca056ea733eb9e2503b2c29f940769f9f47a8a