mobile-weak-crypto

mobile-weak-crypto is a skill for Claude Code from securityfortech/hacking-skills. It costs 132 tokens per session (1,875 once invoked), scanned A, original, no licence file.

A mobile-app security checker for Android and iOS cryptography. Cryptography protects data by using keys and mathematical transformations.

In plain words
What is it for?
Use it to review mobile code for weak algorithms, hardcoded keys, unsafe IVs, insecure random values, and incorrect key storage or encryption settings.
Why use it?
It helps identify encryption and random-number choices that may expose app data or make keys predictable.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the mobile plugin — 7 skills shipped together

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.

agentmods
npx agentmods add skills/securityfortech/hacking-skills/mobile-weak-crypto
Any agent
npx skills add securityfortech/hacking-skills --skill mobile-weak-crypto
Clone the repo
git clone --depth 1 https://github.com/securityfortech/hacking-skills

Made for: Claude Code.

Or install mobile, the plugin that ships this one along with the rest of its 7 skills.

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 mobile-weak-crypto

README.md
[![agentmods](https://agentmods.dev/badge/skills/securityfortech/hacking-skills/mobile-weak-crypto.svg)](https://agentmods.dev/skills/securityfortech/hacking-skills/mobile-weak-crypto)
Your own site
<a href="https://agentmods.dev/skills/securityfortech/hacking-skills/mobile-weak-crypto"><img src="https://agentmods.dev/badge/skills/securityfortech/hacking-skills/mobile-weak-crypto.svg" alt="Measured on agentmods" height="20"></a>
Per session 132 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,875 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00132 $0.01875
Opus 5 $0.00066 $0.00937
Sonnet 5 $0.00026 $0.00375
Haiku 4.5 $0.00013 $0.00187

Measured 6d ago against content hash 3bbdd7123961, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

mobile-weak-crypto 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 6d 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.

skills/mobile/crypto/mobile-weak-crypto/SKILL.md · 127 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

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. 6d ago First seen · 127 lines · 132 tokens per session scan A 3bbdd7123961

Subscribe to this mod's changes

mobile-weak-crypto is a skill published in the GitHub repository securityfortech/hacking-skills (11 stars, last pushed 5mo ago), with no licence file. It adds 132 tokens to every session and 1,875 once invoked, about $0.0007 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 2026-08-30.

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