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| author | murilo ijanc | 2026-03-24 21:45:05 -0300 |
|---|---|---|
| committer | murilo ijanc | 2026-03-24 21:45:05 -0300 |
| commit | 01c17c68277ff88fab812920732d9bbe9e6bb571 (patch) | |
| tree | 035398ae34263b981b621c6275835d2cc6847d57 /book/en/heir-recovery.html | |
| parent | f186b71ca51e83837db60de13322394bb5e6d348 (diff) | |
| download | website-main.tar.gz | |
Remove old Zola-generated content, keep only the essential
landing page with about, contact, and license sections.
Diffstat (limited to 'book/en/heir-recovery.html')
| -rw-r--r-- | book/en/heir-recovery.html | 314 |
1 files changed, 0 insertions, 314 deletions
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But what happens when you can no longer access your own keys? Tesseras uses <strong>Shamir’s Secret Sharing</strong> to let you distribute your cryptographic identity to trusted heirs.</p> -<h2 id="how-it-works"><a class="header" href="#how-it-works">How it works</a></h2> -<p>Shamir’s Secret Sharing splits a secret into N shares with a threshold T. Any T shares can reconstruct the original secret. Fewer than T shares reveal <strong>nothing</strong> — this is information-theoretically secure, not just computationally hard to break.</p> -<p>For example, with threshold 2 and 3 total shares:</p> -<ul> -<li>Give share 1 to your spouse</li> -<li>Give share 2 to your sibling</li> -<li>Give share 3 to your lawyer</li> -</ul> -<p>Any two of them can recover your identity. A single share alone is useless.</p> -<h2 id="creating-heir-shares"><a class="header" href="#creating-heir-shares">Creating heir shares</a></h2> -<pre><code class="language-bash">tes heir create --threshold 2 --shares 3 -</code></pre> -<p>This splits your Ed25519 identity key into 3 shares (requiring 2 to reconstruct) and saves them to <code>./heir-shares/</code>:</p> -<pre><code>heir-shares/ -├── heir_share_1.bin # MessagePack binary -├── heir_share_1.txt # Human-readable base64 text -├── heir_share_2.bin -├── heir_share_2.txt -├── heir_share_3.bin -└── heir_share_3.txt -</code></pre> -<p>Each share is generated in two formats:</p> -<ul> -<li><strong>Binary</strong> (<code>.bin</code>) — compact MessagePack, suitable for USB drives or digital storage</li> -<li><strong>Text</strong> (<code>.txt</code>) — base64 with human-readable header, suitable for printing on paper</li> -</ul> -<p>The text format looks like this:</p> -<pre><code>--- TESSERAS HEIR SHARE --- -Format: v1 -Owner: a1b2c3d4e5f6a7b8 (fingerprint) -Share: 1 of 3 (threshold: 2) -Session: 9f8e7d6c5b4a3210 -Created: 2026-02-15 - -<base64-encoded data> ---- END HEIR SHARE --- -</code></pre> -<h2 id="reconstructing-from-shares"><a class="header" href="#reconstructing-from-shares">Reconstructing from shares</a></h2> -<p>When heirs need to recover the identity:</p> -<pre><code class="language-bash">tes heir reconstruct heir_share_1.txt heir_share_2.bin --output-dir ./recovered-keys -</code></pre> -<p>The command auto-detects whether each file is binary or text format. It validates that all shares belong to the same session and owner, verifies checksums, and reconstructs the Ed25519 keypair.</p> -<p>To install the recovered keys as the active identity:</p> -<pre><code class="language-bash">tes heir reconstruct share1.txt share2.txt --output-dir ./recovered --install -</code></pre> -<p>This backs up the current identity before replacing it.</p> -<h2 id="inspecting-a-share"><a class="header" href="#inspecting-a-share">Inspecting a share</a></h2> -<p>To view metadata about a share without exposing secret data:</p> -<pre><code class="language-bash">tes heir info heir_share_1.txt -</code></pre> -<p>Output:</p> -<pre><code>Heir Share Information: - Format version: 1 - Share: 1 of 3 (threshold: 2) - Session: 9f8e7d6c5b4a3210 - Owner fingerprint: a1b2c3d4e5f6a7b8 - Share data size: 34 bytes - Checksum: valid -</code></pre> -<h2 id="security-considerations"><a class="header" href="#security-considerations">Security considerations</a></h2> -<ul> -<li><strong>Threshold choice</strong>: a threshold of 2-of-3 or 3-of-5 is recommended for most people. Higher thresholds are more secure but require more heirs to cooperate.</li> -<li><strong>Physical storage</strong>: print the <code>.txt</code> files on acid-free paper and store in separate physical locations (safe deposit boxes, different homes). Paper survives decades without degradation.</li> -<li><strong>Never store shares together</strong>: the entire point of splitting is distribution. Keeping all shares in one place defeats the purpose.</li> -<li><strong>Session isolation</strong>: each <code>heir create</code> call generates a fresh session ID. Shares from different sessions cannot be mixed — this prevents confusion after key rotations.</li> -<li><strong>Checksum verification</strong>: each share includes a BLAKE3 checksum. Corrupted shares (OCR errors, bit rot) are detected before reconstruction is attempted.</li> -<li><strong>Re-split after key changes</strong>: if you regenerate your identity, create new heir shares and securely destroy the old ones.</li> -</ul> -<h2 id="design-principles"><a class="header" href="#design-principles">Design principles</a></h2> -<ul> -<li><strong>Information-theoretic security</strong> — T-1 shares reveal exactly zero information about the secret. This is not a computational assumption; it is mathematically proven.</li> -<li><strong>Corruption detection</strong> — BLAKE3 checksums catch bit rot, OCR errors, and truncation before any reconstruction attempt.</li> -<li><strong>Format resilience</strong> — dual output (binary + text) ensures shares survive different storage media failure modes.</li> -<li><strong>Backward compatibility</strong> — the secret blob is versioned, so future versions can include additional key material without breaking existing shares.</li> -</ul> - - </main> - - <nav class="nav-wrapper" aria-label="Page navigation"> - <!-- Mobile navigation buttons --> - <a rel="prev" href="encryption.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> - <span class=fa-svg><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 512"><!--! 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