disk-encryption

A workflow for encrypting the root filesystem of Jetson devices during flashing, the process of installing the device software and operating system.

In plain words
What is it for?
Use it to prepare the NVIDIA software sources, generate encryption keys, create an encrypted system image, and flash a supported Jetson device from an Ubuntu host.
Why use it?
It adds filesystem encryption using OP-TEE-generated keys, but requires rebuilding and re-flashing the device, which erases its existing data.

Skill for Claude CodeCodex

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/seeed-projects/seeed-jetson-developtool/disk-encryption
Any agent
npx skills add Seeed-Projects/Seeed-Jetson-DevelopTool --skill disk-encryption
Clone the repo
git clone --depth 1 https://github.com/Seeed-Projects/Seeed-Jetson-DevelopTool

Made for: Claude Code, Codex.

Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,940 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00083 $0.01940
Opus 5 $0.00042 $0.00970
Sonnet 5 $0.00017 $0.00388
Haiku 4.5 $0.00008 $0.00194

Measured 2d ago against content hash 5deb1fe40860, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

disk-encryption scanned grade B 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 2d 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo tar xpf Tegra_Linux_Sample-Root-Filesystem_r36.4.3_aarch64.tbz2 -C Linux_for_Tegra/rootfs/
seeed_jetson_develop/skills/openclaw/disk-encryption/SKILL.md · 224 lines

How it starts

The opening of the file, as written. The whole thing — 224 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Disk Encryption for Jetson

Encrypts the Jetson root filesystem during the flashing process using OPTEE-generated keys. This is a destructive operation — the device must be re-flashed.


Execution model

Run one phase at a time. After each phase:

  • Relay all output to the user.
  • If output contains [STOP] → stop, consult the failure decision tree.
  • If output ends with [OK] → tell the user "Phase N complete" and proceed.

WARNING: This process re-flashes the entire device. All existing data on the Jetson will be erased.


Prerequisites

Requirement Detail
Host PC Ubuntu 20.04 or 22.04 (x86_64)
Jetson device e.g. reComputer J401 (Orin) in recovery mode
L4T version 36.4.3 (adjust commands for other versions)
USB cable Connecting host to Jetson recovery port
Storage ~50GB free on host for BSP and build artifacts

Phase 1 — Prepare BSP workspace on host PC (~15 min)

Download and extract NVIDIA L4T BSP and root filesystem:

tar xf Jetson_Linux_r36.4.3_aarch64.tbz2
sudo tar xpf Tegra_Linux_Sample-Root-Filesystem_r36.4.3_aarch64.tbz2 -C Linux_for_Tegra/rootfs/

Sync kernel source:

cd Linux_for_Tegra/source/
./source_sync.sh -t jetson_36.4.3
cd ../..

Clone Seeed BSP overlay and apply:

sudo apt update && sudo apt install -y git-lfs
mkdir -p github/Linux_for_Tegra
git clone https://github.com/Seeed-Studio/Linux_for_Tegra.git -b r36.4.3 --depth=1 github/Linux_for_Tegra
cp -r github/Linux_for_Tegra/* Linux_for_Tegra/
cd Linux_for_Tegra
sudo ./apply_binaries.sh

[OK] when apply_binaries.sh completes. [STOP] if download or extraction fails.


Phase 2 — Install build dependencies and compile kernel (~20–30 min)

sudo apt-get install -y build-essential flex bison libssl-dev sshpass \
    abootimg nfs-kernel-server libxml2-utils qemu-user-static

Set up cross-compiler (download the toolchain first):

mkdir -p l4t-gcc
tar xf aarch64--glibc--stable-2022.08-1.tar.bz2 -C ./l4t-gcc
export ARCH=arm64
export CROSS_COMPILE=$(pwd)/l4t-gcc/aarch64--glibc--stable-2022.08-1/bin/aarch64-buildroot-linux-gnu-

Read the full file on GitHub · 224 lines

Files

What ships with it

2 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. 2d ago First seen · 224 lines · 83 tokens per session scan B 5deb1fe40860

Subscribe to this mod's changes

disk-encryption is a skill published in the GitHub repository Seeed-Projects/Seeed-Jetson-DevelopTool (54 stars, last pushed 3d ago), licensed MIT. It adds 83 tokens to every session and 1,940 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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