What is android-security-hardened?

A guide for protecting sensitive data and application access in Android apps. It covers biometric login, local encryption, Android Keystore key storage, device-integrity checks, certificate pinning, and security logging.

Adding fingerprint or face unlock, encrypting tokens and profiles, storing keys safely, detecting rooted devices or emulators, pinning certificates, and configuring secure Android networking.

It helps reduce risks from stolen data, unsafe key storage, tampered devices, and untrusted network connections. It provides security practices for identity, confidentiality, integrity, availability, and auditing.

android-security-hardened — Skill by prasad-vennam

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 prasad-vennam/Awesome-Android-AI-Agent-Skills --skill android-security-hardened

Clone the repo

git clone --depth 1 https://github.com/prasad-vennam/Awesome-Android-AI-Agent-Skills

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/prasad-vennam/awesome-android-ai-agent-skills/android-security-hardened/github.svg)](https://agentmods.dev/skills/prasad-vennam/awesome-android-ai-agent-skills/android-security-hardened)

Your own site

<a href="https://agentmods.dev/skills/prasad-vennam/awesome-android-ai-agent-skills/android-security-hardened"><img src="https://agentmods.dev/badge/skills/prasad-vennam/awesome-android-ai-agent-skills/android-security-hardened/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/prasad-vennam/awesome-android-ai-agent-skills/android-security-hardened"><img src="https://agentmods.dev/badge/skills/prasad-vennam/awesome-android-ai-agent-skills/android-security-hardened.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 869 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.00024	$0.00869
Opus 5.5	$0.00010	$0.00348
Sonnet 5.5	$0.00005	$0.00174
Haiku 4.5	$0.00002	$0.00087

Measured 2mo ago against content hash 76453f490bb2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

android-security-hardened 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 2mo 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/android-security-hardened/SKILL.md · 82 lines

How it starts

The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Android Security Hardening 🛡️🔐

Professional security practices for protecting sensitive user data, identity, and application integrity on Android devices.

⚡ When to Use

Biometric Authentication: Fingerprint/Face ID for app lock.
Local Encryption: Securing login tokens or user profiles.
Keystore Management: Safe storage of cryptographic keys.
Root/Emulator Detection: Verifying device integrity for high-risk apps.
Certificate Pinning: Hardening HTTPS via network security config.

🏗️ The 5 Pillars of Security

Identity: Strong authentication (OIDC, Biometrics).
Confidentiality: Encrypting data at rest and in transit.
Integrity: Preventing tampering (App signing, Root check).
Available: Ensuring resilience (DDoS protection, Offline access control).
Audit: Logging security-relevant events safely.

🔑 KeyStore & Cryptography

1. Android Keystore System

Rule: NEVER store encryption keys in resources or hardcoded.
Use KeyGenerator with purpose(PURPOSE_ENCRYPT | PURPOSE_DECRYPT) and blockMode(BLOCK_MODE_GCM).
Use GCM (Galois/Counter Mode) for authenticated encryption.

2. EncryptedSharedPreferences

Rule: Use Jetpack Security to encrypt standard SharedPreferences.

val masterKey = MasterKey.Builder(context).setKeyScheme(AES256_GCM).build()
val sharedPrefs = EncryptedSharedPreferences.create(
    context, "secret_prefs", masterKey, AES256_SIV, AES256_GCM
)

🔐 Biometric Auth (BiometricPrompt)

Use the androidx.biometric library for consistent UI across devices.
Class 3 (Strong): Highest security, requires biological match.
Class 2 (Weak): Fallback for older devices.

🛡️ Device Integrity & Hardening

Root Detection: Use libraries like RootBeer or Google Play Integrity API.
Emulator Detection: Verify system properties (ro.product.model, ro.hardware).
Certificate Pinning: Use the network-security-config.xml to limit trusted CAs.
ProGuard/R8: Obfuscate sensitive classes and strings. CRITICAL WARNING: Misconfigured R8 rules will crash the app if reflection relies on stripped classes. (See CI/CD Expert Skill for R8 configuration guidelines).
No Backup: Use android:allowBackup="false" for sensitive data.

Read the full file on GitHub · 82 lines

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.

2mo ago First seen · 82 lines · 24 tokens per session scan A 76453f490bb2

Subscribe to this mod's changes

android-security-hardened is a skill published in the GitHub repository prasad-vennam/Awesome-Android-AI-Agent-Skills (11 stars, last pushed 7mo ago), licensed MIT. It adds 24 tokens to every session and 869 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-31.

Mobile Security

android-security-hardened next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
android-security-hardenedprasad-vennam/Awesome-Android-AI-Agent-Skills	Skill	11	7mo ago	MIT	A	24	Claude Code, Codex
orca-emulator-androidstablyai/orca	Skill	117k	yesterday	MIT	A	102	Claude Code, Codex
glance-canonical-layoutsandroid/skills	Skill	10k	yesterday	Apache-2.0	A	56	Claude Code
android-tombstone-symbolicationdotnet/skills	Skill	5.8k	yesterday	MIT	A	176	Claude Code
dogfoodcallstack/agent-device	Skill	5.3k	yesterday	MIT	A	55	Claude Code
winapp-mauimicrosoft/winappCli	Skill	1.4k	yesterday	MIT	A	68	Claude Code
app_remixrome-os/rome	Skill	889	yesterday	MIT	A	50	Claude Code, Codex