crypto-web-attack

crypto-web-attack is a skill for Claude Code, Codex from wgpsec/AboutSecurity. It costs 102 tokens per session (1,952 once invoked), scanned A, original, no licence file.

A method for testing weaknesses in cryptography used by web applications, including padding-oracle flaws, weak randomness, predictable tokens, and hash length-extension opportunities. It also covers attacks against CBC and ECB block-based encryption.

In plain words
What is it for?
It is for testing encrypted web tokens and identifying padding-oracle, CBC bit-flip, weak-randomness, hash-length-extension, and ECB block-reordering weaknesses.
Why use it?
It helps security testers investigate applications whose tokens, encryption modes, or hashes are implemented unsafely.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit It is for testing encrypted web tokens and identifying padding-oracle, CBC bit-flip, weak-randomness, hash-length-extension, and ECB block-reordering weaknesses.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wgpsec/aboutsecurity/crypto-web-attack
Install

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.

Any agent
npx skills add wgpsec/AboutSecurity --skill crypto-web-attack
Clone the repo
git clone --depth 1 https://github.com/wgpsec/AboutSecurity

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for crypto-web-attack

README.md
[![agentmods](https://agentmods.dev/badge/skills/wgpsec/aboutsecurity/crypto-web-attack.svg)](https://agentmods.dev/skills/wgpsec/aboutsecurity/crypto-web-attack)
Your own site
<a href="https://agentmods.dev/skills/wgpsec/aboutsecurity/crypto-web-attack"><img src="https://agentmods.dev/badge/skills/wgpsec/aboutsecurity/crypto-web-attack.svg" alt="Measured on agentmods" height="20"></a>
Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,952 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00102 $0.01952
Opus 5 $0.00051 $0.00976
Sonnet 5 $0.00020 $0.00390
Haiku 4.5 $0.00010 $0.00195

Measured 4d ago against content hash 4f01bb3fc1e4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

crypto-web-attack 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 4d 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.

r = requests.get(f"{URL}?token={ciphertext_hex}")
skills/exploit/advanced/crypto-web-attack/SKILL.md · 207 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

3 files 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.

Changes

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.

  1. 4d ago First seen · 207 lines · 102 tokens per session scan A 4f01bb3fc1e4

Subscribe to this mod's changes

crypto-web-attack is a skill published in the GitHub repository wgpsec/AboutSecurity (1,721 stars, last pushed 8d ago), with no licence file. It adds 102 tokens to every session and 1,952 once invoked, about $0.0005 per session on Opus 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 2026-09-03.

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