What is bitlocker-design?

Design guidance for encrypting Windows computer drives with BitLocker and managing them through Microsoft Intune. It covers recovery keys stored in Microsoft Entra ID, Microsoft's cloud identity service, along with TPM hardware, startup authentication, and removable drives.

Use it to choose encryption and startup settings for corporate laptops, high-sensitivity administrator devices, kiosks, legacy devices, and removable media.

It helps protect data if a Windows device is lost or stolen and helps plan recovery and compliance before deployment.

bitlocker-design — Skill for Claude Code and Codex by vinayaklatthe

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 vinayaklatthe/microsoft-security-skills --skill bitlocker-design

Clone the repo

git clone --depth 1 https://github.com/vinayaklatthe/microsoft-security-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/vinayaklatthe/microsoft-security-skills/bitlocker-design/github.svg)](https://agentmods.dev/skills/vinayaklatthe/microsoft-security-skills/bitlocker-design)

Your own site

<a href="https://agentmods.dev/skills/vinayaklatthe/microsoft-security-skills/bitlocker-design"><img src="https://agentmods.dev/badge/skills/vinayaklatthe/microsoft-security-skills/bitlocker-design/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/vinayaklatthe/microsoft-security-skills/bitlocker-design"><img src="https://agentmods.dev/badge/skills/vinayaklatthe/microsoft-security-skills/bitlocker-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 166 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,773 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	$0.00166	$0.01773
Opus 5	$0.00083	$0.00886
Sonnet 5	$0.00033	$0.00355
Haiku 4.5	$0.00017	$0.00177

Measured 11d ago against content hash bfbe12cd17f0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

bitlocker-design 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 11d 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/bitlocker-design/SKILL.md · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.

BitLocker Design

BitLocker provides full-volume encryption for Windows devices, protecting data at rest against device loss or theft. In cloud-managed estates it is deployed and monitored through Intune disk encryption endpoint security policies with recovery key escrow to Microsoft Entra ID.

When to use

Encrypting Windows endpoints and centrally managing recovery keys and compliance. Use this skill to choose pre-boot mode, configure silent enablement, and plan recovery before rollout.

Do not use this skill for general Intune device baseline (intune-device-mgmt), macOS FileVault (use Intune disk encryption policy directly), or Azure VM disk encryption (azure-key-vault).

Pick the configuration by device type

Device profile	Pre-boot auth	Encryption	Notes
Modern corporate laptop (TPM 2.0, Secure Boot)	TPM-only (no PIN)	XTS-AES 256	Default; silent enable
High-sensitivity admin / Tier 0 (PAW)	TPM + PIN	XTS-AES 256	Stronger; pairs with PAW
Kiosk / unattended	TPM-only with Network Unlock	XTS-AES 256	No user to type PIN
Legacy device (no TPM 2.0 / no Secure Boot)	Replace device	n/a	Don't try to enable on bare-metal legacy
Removable media (USB)	BitLocker To Go (password or smart card)	XTS-AES 256	Separate policy
Fixed data drives	Auto-unlock with OS drive	XTS-AES 256	Encrypt with OS drive

Rule of thumb: TPM-only + silent enablement is the right default for 95% of modern corporate laptops. TPM+PIN doubles the security against physical attack but triples support calls. Reserve TPM+PIN for Tier 0 / PAW.

Approach

Confirm prerequisites — TPM 2.0 (TPM 1.2 in narrow cases), Secure Boot UEFI, supported Windows edition (Pro/Enterprise), Entra-joined or hybrid-joined (required for key escrow). Verify: Get-Tpm shows TpmReady=True; manage-bde -status shows the drive as encryptable.
Configure Intune disk encryption policy — Endpoint security → Disk encryption → create a BitLocker profile. Set encryption method (XTS-AES 256), encrypt OS drive + fixed drives, pre-boot mode (TPM-only by default).

Read the full file on GitHub · 119 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.

11d ago First seen · 119 lines · 166 tokens per session scan A bfbe12cd17f0

Subscribe to this mod's changes

bitlocker-design is a skill published in the GitHub repository vinayaklatthe/microsoft-security-skills (172 stars, last pushed 2mo ago), licensed MIT. It adds 166 tokens to every session and 1,773 once invoked, about $0.0008 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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