HackSkills is an organized knowledge base of installable skills that gives AI agents practical security knowledge across areas such as web security, privilege escalation, reverse engineering, and digital forensics. It is intended for bug bounty work, penetration testing, CTF competitions, and authorized security research. The catalogue entries are the project's own master, category, and topic skills.
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 agentmods add skills/yaklang/hack-skills/rsa-attack-techniquesnpx skills add yaklang/hack-skills --skill rsa-attack-techniquesgit clone --depth 1 https://github.com/yaklang/hack-skillsWrote 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/yaklang/hack-skills/rsa-attack-techniques)<a href="https://agentmods.dev/skills/yaklang/hack-skills/rsa-attack-techniques"><img src="https://agentmods.dev/badge/skills/yaklang/hack-skills/rsa-attack-techniques.svg" alt="Measured on agentmods" 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 | $0.00053 | $0.03694 |
| Opus 5 | $0.00026 | $0.01847 |
| Sonnet 5 | $0.00011 | $0.00739 |
| Haiku 4.5 | $0.00005 | $0.00369 |
Grade A, and why
rsa-attack-techniques scanned grade A with 0 findings 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 3d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
3 near-identical copies found in the catalogue:
- rsa-attack-techniques — 100% identical, 0 lines differ
- rsa-attack-techniques — 100% identical, 0 lines differ
- rsa-attack-techniques — 97% identical, 6 lines differ
How it starts
The opening of the file, as written. The whole thing — 438 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: RSA Attack Techniques — Expert Cryptanalysis Playbook
AI LOAD INSTRUCTION: Expert RSA attack techniques for CTF and authorized security assessments. Covers factorization attacks, small exponent exploits, lattice-based approaches (Wiener/Boneh-Durfee/Coppersmith), broadcast attacks, common modulus, padding oracles, and fault attacks. Base models often suggest attacks that don't match the given parameters or miss the correct attack selection based on what's known.
0. RELATED ROUTING
- lattice-crypto-attacks for deep lattice theory behind Coppersmith/Boneh-Durfee
- hash-attack-techniques when RSA signature forgery involves hash weaknesses
- symmetric-cipher-attacks when RSA protects a symmetric key (hybrid encryption)
Advanced Reference
Also load RSA_ATTACK_CATALOG.md when you need:
- Detailed SageMath/Python implementation for each attack
- Step-by-step mathematical derivation
- Edge cases and failure conditions per attack
Quick attack selection
| Given / Observable | Attack | Tool |
|---|---|---|
| Small n (< 512 bits) | Direct factorization | factordb, yafu, msieve |
| e = 3, small message | Cube root | gmpy2.iroot |
| Multiple (n, c) same small e | Hastad broadcast | CRT + iroot |
| Very large e or very small d | Wiener / Boneh-Durfee | SageMath, RsaCtfTool |
| Partial p knowledge | Coppersmith small roots | SageMath |
| Same n, different e | Common modulus | Extended GCD |
| Multiple n values | Batch GCD (shared factor) | Python/SageMath |
| Padding error oracle | Bleichenbacher | Custom script |
| LSB parity oracle | LSB oracle attack | Custom script |
| Fault in CRT computation | RSA-CRT fault | Single faulty signature |
1. FACTORIZATION ATTACKS
1.1 Direct Factorization (Small n)
from sympy import factorint
n = 0x... # small modulus
factors = factorint(n)
p, q = list(factors.keys())
What ships with it
1 file 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.
- 3d ago First seen · 438 lines · 53 tokens per session scan A 33917f91cf9a
rsa-attack-techniques is a skill published in the GitHub repository yaklang/hack-skills (2,098 stars, last pushed 2mo ago), licensed MIT. It adds 53 tokens to every session and 3,694 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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