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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Crypto Lab — Paul Clark / systemslibrarian</title>
<meta name="description" content="A curated cryptography lab — from fundamentals to cutting-edge research" />
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link href="https://fonts.googleapis.com/css2?family=DM+Mono:wght@300;400;500&family=Fraunces:opsz,wght,SOFT@9..144,400,50;9..144,500,50&display=swap" rel="stylesheet" />
<script>
(function(){
if(localStorage.getItem('theme')==='light')
document.documentElement.classList.add('light');
})();
</script>
<style>
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
--bg: #071016;
--bg-soft: #0b1821;
--panel: rgba(8, 18, 25, 0.88);
--panel-strong: #0d1d27;
--border: rgba(99, 128, 146, 0.2);
--border-strong: rgba(99, 128, 146, 0.34);
--text: #c8d9e5;
--text-dim: #7e98aa;
--text-hi: #f2f8fb;
--teal: #35d6bb;
--amber: #ffb84d;
--crimson: #ff6b7f;
--violet: #9f88ff;
--mono: 'DM Mono', monospace;
--serif: 'Fraunces', Georgia, serif;
--shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}
html { scroll-behavior: smooth; }
body {
min-height: 100vh;
overflow-x: hidden;
background:
radial-gradient(circle at top center, rgba(53, 214, 187, 0.12), transparent 32%),
radial-gradient(circle at 85% 15%, rgba(159, 136, 255, 0.08), transparent 24%),
linear-gradient(180deg, #081016 0%, #071016 50%, #060d13 100%);
color: var(--text);
font-family: var(--mono);
font-size: 14px;
line-height: 1.65;
}
body::before {
content: '';
position: fixed;
inset: 0;
background-image:
linear-gradient(rgba(38, 62, 78, 0.22) 1px, transparent 1px),
linear-gradient(90deg, rgba(38, 62, 78, 0.22) 1px, transparent 1px);
background-size: 48px 48px;
mask-image: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.18));
pointer-events: none;
z-index: 0;
}
a { color: inherit; }
.wrap {
position: relative;
z-index: 1;
width: min(1280px, calc(100% - 40px));
margin: 0 auto;
}
.hero {
padding: 42px 0 30px;
}
.feature-card,
.project-card,
.footer-quote {
border: 1px solid var(--border);
background: var(--panel);
backdrop-filter: blur(12px);
box-shadow: var(--shadow);
}
.hero-main {
padding: 34px;
background:
linear-gradient(145deg, rgba(53, 214, 187, 0.07), transparent 30%),
linear-gradient(180deg, rgba(8, 17, 24, 0.92), rgba(8, 17, 24, 0.82));
border: 1px solid var(--border);
box-shadow: var(--shadow);
}
.eyebrow {
display: inline-flex;
align-items: center;
gap: 10px;
margin-bottom: 22px;
color: var(--amber);
text-transform: uppercase;
letter-spacing: 0.16em;
font-size: 11px;
}
.eyebrow::before {
content: '';
width: 34px;
height: 1px;
background: currentColor;
}
h1 {
max-width: 12ch;
font-family: var(--serif);
font-size: clamp(3.4rem, 8vw, 6.4rem);
font-weight: 500;
line-height: 0.95;
color: var(--text-hi);
letter-spacing: -0.04em;
text-wrap: balance;
}
h1 span {
color: var(--teal);
font-style: italic;
}
.hero-copy {
max-width: 62ch;
margin-top: 24px;
color: var(--text);
font-size: 14px;
}
.hero-actions {
display: flex;
gap: 12px;
flex-wrap: wrap;
margin-top: 30px;
}
.card-kicker {
display: inline-flex;
align-items: center;
gap: 8px;
color: var(--text-dim);
text-transform: uppercase;
letter-spacing: 0.14em;
font-size: 10px;
cursor: pointer;
transition: color 0.2s ease;
position: relative;
z-index: 2;
}
.card-kicker:hover {
color: var(--teal);
}
.card-kicker::before {
content: '';
width: 18px;
height: 1px;
background: currentColor;
}
.content {
padding: 18px 0 56px;
}
.content .wrap {
display: grid;
grid-template-columns: repeat(4, minmax(0, 1fr));
gap: 18px;
}
.feature-grid,
.project-grid {
display: contents;
}
.feature-card {
position: relative;
overflow: hidden;
padding: 26px;
display: flex;
flex-direction: column;
min-height: 260px;
text-decoration: none;
transition: transform 0.24s ease, border-color 0.24s ease, background 0.24s ease;
background:
linear-gradient(160deg, rgba(255, 255, 255, 0.03), transparent 38%),
rgba(9, 18, 24, 0.9);
}
.feature-card::after,
.project-card::after {
content: '';
position: absolute;
inset: auto 0 0 0;
height: 2px;
background: linear-gradient(90deg, var(--accent, var(--teal)), transparent 72%);
opacity: 0.9;
}
.feature-card:hover,
.project-card:hover {
transform: translateY(-3px);
border-color: rgba(242, 248, 251, 0.24);
background: rgba(12, 23, 31, 0.98);
}
.feature-title,
.project-title {
font-family: var(--serif);
font-size: 1.65rem;
font-weight: 400;
line-height: 1.05;
color: var(--text-hi);
margin: 14px 0 12px;
}
.feature-copy,
.project-copy {
color: var(--text);
font-size: 12.5px;
line-height: 1.75;
}
.feature-meta,
.project-meta {
margin-top: auto;
display: flex;
align-items: center;
justify-content: space-between;
gap: 12px;
padding-top: 18px;
border-top: 1px solid rgba(99, 128, 146, 0.18);
}
.stack {
display: flex;
gap: 8px;
flex-wrap: wrap;
}
.chip {
padding: 4px 8px;
border: 1px solid var(--border-strong);
color: var(--text);
text-transform: uppercase;
letter-spacing: 0.09em;
font-size: 9.5px;
background: rgba(8, 17, 24, 0.78);
}
.arrow {
color: var(--accent, var(--teal));
font-size: 16px;
transition: transform 0.2s ease;
}
.feature-card:hover .arrow,
.project-card:hover .arrow {
transform: translateX(4px);
}
.project-card {
position: relative;
overflow: hidden;
padding: 26px;
min-height: 260px;
display: flex;
flex-direction: column;
text-decoration: none;
transition: transform 0.24s ease, border-color 0.24s ease, background 0.24s ease;
background: rgba(9, 18, 24, 0.9);
}
.project-title {
margin-top: 12px;
}
.footer {
padding: 0 0 48px;
}
.footer-quote {
padding: 28px;
display: flex;
align-items: center;
justify-content: space-between;
gap: 24px;
flex-wrap: wrap;
background:
linear-gradient(180deg, rgba(11, 24, 33, 0.92), rgba(8, 17, 24, 0.82));
}
blockquote {
font-family: var(--serif);
color: var(--text-hi);
font-size: 1.35rem;
line-height: 1.4;
max-width: 34ch;
}
cite {
color: var(--teal);
font-style: normal;
text-transform: uppercase;
letter-spacing: 0.14em;
font-size: 11px;
}
@keyframes fadeUp {
from { opacity: 0; transform: translateY(18px); }
to { opacity: 1; transform: translateY(0); }
}
.cl-header,
.hero-main,
.feature-grid,
.project-grid,
.footer-quote {
animation: fadeUp 0.6s ease both;
}
@media (max-width: 760px) {
.content .wrap {
grid-template-columns: 1fr;
}
.wrap {
width: min(100% - 24px, 1280px);
}
.footer-quote {
align-items: flex-start;
}
.hero-actions {
width: 100%;
}
.hero-main,
.feature-card,
.project-card,
.footer-quote {
padding: 22px;
}
h1 {
font-size: clamp(2.7rem, 16vw, 4.3rem);
}
blockquote {
font-size: 1.15rem;
}
}
.filter-bar {
grid-column: 1 / -1;
position: sticky;
top: 0;
z-index: 10;
background: rgba(7, 16, 22, 0.92);
backdrop-filter: blur(16px);
-webkit-backdrop-filter: blur(16px);
padding: 14px 16px 12px;
margin: -14px 0 4px;
border-bottom: 1px solid var(--border);
}
.search-bar {
position: relative;
}
.search-bar input {
width: 100%;
padding: 14px 18px 14px 44px;
font-family: var(--mono);
font-size: 13px;
color: var(--text-hi);
background: rgba(9, 18, 24, 0.9);
border: 1px solid var(--border-strong);
outline: none;
transition: border-color 0.2s ease;
}
.search-bar input::placeholder {
color: var(--text-dim);
letter-spacing: 0.04em;
}
.search-bar input:focus {
border-color: var(--teal);
}
.search-bar::before {
content: '⌕';
position: absolute;
left: 16px;
top: 50%;
transform: translateY(-50%);
color: var(--text-dim);
font-size: 16px;
pointer-events: none;
}
.search-kbd {
position: absolute;
right: 12px;
top: 50%;
transform: translateY(-50%);
padding: 2px 8px;
font-family: var(--mono);
font-size: 11px;
color: var(--text-dim);
border: 1px solid var(--border-strong);
background: rgba(8, 17, 24, 0.78);
pointer-events: none;
transition: opacity 0.15s ease;
}
.search-bar input:focus ~ .search-kbd {
opacity: 0;
}
.search-clear {
position: absolute;
right: 12px;
top: 50%;
transform: translateY(-50%);
width: 28px;
height: 28px;
display: none;
place-items: center;
border: 1px solid var(--border-strong);
background: rgba(53, 214, 187, 0.10);
color: var(--teal);
font-size: 15px;
cursor: pointer;
padding: 0;
line-height: 1;
font-family: var(--mono);
border-radius: 2px;
transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
z-index: 2;
}
.search-clear:hover {
color: var(--text-hi);
background: rgba(53, 214, 187, 0.20);
border-color: var(--teal);
}
.search-clear.visible {
display: grid;
}
.search-clear.visible ~ .search-kbd {
display: none;
}
.filter-row {
display: flex;
align-items: flex-start;
justify-content: space-between;
gap: 14px;
margin-top: 12px;
flex-wrap: wrap;
}
.filter-chips {
display: flex;
flex-direction: column;
gap: 6px;
flex: 1 1 680px;
min-width: 0;
}
.filter-chip-row {
display: flex;
gap: 6px;
flex-wrap: wrap;
}
.filter-chip {
padding: 6px 10px;
min-height: 30px;
border: 1px solid var(--border-strong);
color: var(--text-dim);
text-transform: uppercase;
letter-spacing: 0.09em;
font-size: 10px;
font-family: var(--mono);
background: rgba(8, 17, 24, 0.78);
cursor: pointer;
transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}
.filter-chip:hover {
border-color: rgba(242, 248, 251, 0.3);
color: var(--text);
}
.filter-chip.active {
border-color: var(--teal);
color: var(--teal);
background: rgba(53, 214, 187, 0.08);
}
.card-count {
color: var(--text-dim);
font-size: 11px;
letter-spacing: 0.06em;
white-space: nowrap;
padding-top: 4px;
}
.no-results {
grid-column: 1 / -1;
text-align: center;
padding: 48px 20px;
color: var(--text-dim);
font-size: 14px;
letter-spacing: 0.06em;
display: none;
}
@media (max-width: 760px) {
.search-kbd { display: none; }
.filter-bar {
padding: 12px 10px 10px;
}
.filter-row {
flex-direction: column;
align-items: stretch;
gap: 10px;
}
.filter-chips {
display: flex;
flex-direction: row;
flex-wrap: wrap;
gap: 8px;
flex-basis: 100%;
}
.filter-chip-row {
display: contents;
}
.filter-chip {
min-height: 34px;
padding: 8px 10px;
font-size: 10px;
}
.card-count {
width: 100%;
text-align: left;
padding-top: 2px;
}
}
@media (min-width: 761px) and (max-width: 1120px) {
.content .wrap {
grid-template-columns: repeat(2, minmax(0, 1fr));
}
}
/* ── Light theme ── */
html.light {
--bg: #f4f6f8;
--bg-soft: #eaecf0;
--panel: rgba(255, 255, 255, 0.92);
--panel-strong: #ffffff;
--border: rgba(60, 80, 100, 0.16);
--border-strong: rgba(60, 80, 100, 0.28);
--text: #3a4a58;
--text-dim: #6b7f8e;
--text-hi: #1a2530;
--teal: #1aab94;
--amber: #c87a00;
--crimson: #d44058;
--violet: #6b5ce7;
--shadow: 0 24px 80px rgba(0, 0, 0, 0.08);
}
html.light body {
background: linear-gradient(180deg, #f4f6f8 0%, #eef1f4 50%, #e8ecf0 100%);
}
html.light body::before {
background-image:
linear-gradient(rgba(60, 80, 100, 0.07) 1px, transparent 1px),
linear-gradient(90deg, rgba(60, 80, 100, 0.07) 1px, transparent 1px);
}
html.light .hero-main {
background: linear-gradient(145deg, rgba(26, 171, 148, 0.06), transparent 30%), rgba(255, 255, 255, 0.88);
}
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/* ── Standardized Crypto Lab header ───────────────────── */
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/* ────────────────────────────────────────────────────── */
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<header class="cl-header">
<div class="cl-header-left">
<div class="cl-badge">CL</div>
<div class="cl-header-text">
<span class="cl-title">CRYPTO LAB</span>
<a class="cl-sub"
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systemslibrarian.dev
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<section class="content" id="catalog">
<div class="wrap">
<div class="filter-bar" id="filter-bar">
<div class="search-bar">
<input type="text" id="demo-search" placeholder="Filter demos…" aria-label="Filter demos" />
<button class="search-clear" id="search-clear" aria-label="Clear search">✕</button>
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<div class="no-results" id="no-results">No demos found.</div>
<div class="feature-grid">
<a class="feature-card secondary" data-category="ENCRYPTION | STEGANOGRAPHY" href="https://systemslibrarian.github.io/snow2/" target="_blank" rel="noopener" style="--accent: #35d6bb;">
<div class="card-kicker">Stream Cipher</div>
<div class="feature-title">Snow 2</div>
<div class="feature-copy">A modern Rust reimplementation of SNOW with AEAD support, Argon2id-derived keys, and steganographic output options.</div>
<div class="feature-meta">
<div class="stack">
<span class="chip">XChaCha20-Poly1305</span>
<span class="chip">Argon2id</span>
<span class="chip">HKDF-SHA-256</span>
<span class="chip">Steganography</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="feature-card secondary" data-category="POST-QUANTUM" href="https://systemslibrarian.github.io/crypto-lab-quantum-vault-kpqc/" target="_blank" rel="noopener" style="--accent: #35d6bb;">
<div class="card-kicker">Post-Quantum</div>
<div class="feature-title">Quantum Vault KpqC</div>
<div class="feature-copy">Threshold file encryption using secret sharing and Korean post-quantum cryptography, compiled to WASM for direct browser use.</div>
<div class="feature-meta">
<div class="stack">
<span class="chip">AES-256-GCM</span>
<span class="chip">Shamir SSS</span>
<span class="chip">SMAUG-T</span>
<span class="chip">HAETAE</span>
</div>
<span class="arrow">→</span>
</div>
</a>
</div>
<div class="project-grid">
<a class="project-card" data-category="HASHING & KDFS" href="https://systemslibrarian.github.io/crypto-lab-phantom-vault/" target="_blank" rel="noopener" style="--accent: #9f88ff;">
<div class="card-kicker">Stateless Passwords</div>
<div class="project-title">Phantom Vault</div>
<div class="project-copy">Derive any password from a master passphrase using HMAC-DRBG. Nothing stored, nothing synced, nothing left behind to breach.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">PBKDF2-SHA-256</span>
<span class="chip">HMAC-DRBG</span>
<span class="chip">Rejection Sampling</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="ATTACKS | RANDOMNESS" href="https://systemslibrarian.github.io/crypto-lab-corrupted-oracle/" target="_blank" rel="noopener" style="--accent: #ff6b7f;">
<div class="card-kicker">Backdoored RNG</div>
<div class="project-title">Corrupted Oracle</div>
<div class="project-copy">A live Dual_EC_DRBG backdoor demo showing state recovery and future-output prediction while standard statistical tests still appear clean.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Dual_EC_DRBG</span>
<span class="chip">HMAC-DRBG</span>
<span class="chip">ChaCha20-DRBG</span>
<span class="chip">P-256</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="RANDOMNESS" href="https://systemslibrarian.github.io/crypto-lab-drbg-arena/" target="_blank" rel="noopener" style="--accent: #9f88ff;">
<div class="card-kicker">CSPRNG</div>
<div class="project-title">DRBG Arena</div>
<div class="project-copy">HMAC_DRBG, CTR_DRBG, and Hash_DRBG with state visualizers, seeding, reseeding, and live NIST SP 800-22 statistical tests. The correct-case companion to Corrupted Oracle.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">HMAC_DRBG</span>
<span class="chip">CTR_DRBG</span>
<span class="chip">Hash_DRBG</span>
<span class="chip">NIST SP 800-90A</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="POST-QUANTUM | KEY EXCHANGE" href="https://systemslibrarian.github.io/crypto-lab-bb84/" target="_blank" rel="noopener" style="--accent: #35d6bb;">
<div class="card-kicker">Post-Quantum Key Distribution</div>
<div class="project-title">BB84</div>
<div class="project-copy">Quantum key distribution with photon polarization, basis sifting, QBER eavesdropper detection, and privacy amplification before AES-256-GCM message encryption.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Photon Polarization</span>
<span class="chip">Basis Sifting</span>
<span class="chip">QBER</span>
<span class="chip">Privacy Amplification</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="POST-QUANTUM | ATTACKS" href="https://systemslibrarian.github.io/crypto-lab-shor/" target="_blank" rel="noopener" style="--accent: #ffb84d;">
<div class="card-kicker">Post-Quantum Cryptanalysis</div>
<div class="project-title">Shor</div>
<div class="project-copy">Modular period finding with QFT and continued fractions to recover integer factors, showing why RSA, ECC, and Diffie-Hellman must migrate to post-quantum alternatives.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Shor's Algorithm</span>
<span class="chip">Period Finding</span>
<span class="chip">QFT</span>
<span class="chip">RSA Factorization</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="POST-QUANTUM | ATTACKS" href="https://systemslibrarian.github.io/crypto-lab-grover/" target="_blank" rel="noopener" style="--accent: #9f88ff;">
<div class="card-kicker">Post-Quantum Cryptanalysis</div>
<div class="project-title">Grover</div>
<div class="project-copy">Amplitude amplification and oracle phase kickback for symmetric-key search, with live probability oscillation and concrete key-size impact (AES-128 to AES-256).</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Grover's Algorithm</span>
<span class="chip">Amplitude Amplification</span>
<span class="chip">Phase Kickback</span>
<span class="chip">AES Key Search</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="ATTACKS" href="https://systemslibrarian.github.io/crypto-lab-model-breach/" target="_blank" rel="noopener" style="--accent: #ff6b7f;">
<div class="card-kicker">Cryptanalysis</div>
<div class="project-title">Model Breach</div>
<div class="project-copy">A HiAE threat-model case study showing candidate enumeration, MITM state recovery, and guess-and-determine attacks when assumptions drift from deployment reality.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Threat Modeling</span>
<span class="chip">Candidate Enumeration</span>
<span class="chip">MITM Recovery</span>
<span class="chip">Guess-and-Determine</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="ENCRYPTION" href="https://systemslibrarian.github.io/crypto-lab-iron-letter/" target="_blank" rel="noopener" style="--accent: #ffb84d;">
<div class="card-kicker">Asymmetric Encryption</div>
<div class="project-title">Iron Letter</div>
<div class="project-copy">ECIES P-256 and RSA-OAEP compared side by side with live timing, key-size tradeoffs, and a simple sealed-letter mental model.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">ECIES P-256</span>
<span class="chip">RSA-OAEP</span>
<span class="chip">AES-256-GCM</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="ENCRYPTION | PRIVACY" href="https://systemslibrarian.github.io/crypto-lab-shadow-vault/" target="_blank" rel="noopener" style="--accent: #35d6bb;">
<div class="card-kicker">Deniable Encryption</div>
<div class="project-title">Shadow Vault</div>
<div class="project-copy">One container, two passphrases, two messages. A practical demonstration of plausible deniability, forensic ambiguity, and browser-first UX around serious primitives.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Argon2id</span>
<span class="chip">ChaCha20-Poly1305</span>
<span class="chip">SHA-256</span>
</div>
<span class="arrow">→</span>
</div>
</a>
<a class="project-card" data-category="ZERO-KNOWLEDGE" href="https://systemslibrarian.github.io/crypto-lab-zk-proof-lab/" target="_blank" rel="noopener" style="--accent: #ff6b7f;">
<div class="card-kicker">Zero-Knowledge Proofs</div>
<div class="project-title">ZK Proof Lab</div>
<div class="project-copy">Six exhibits from Ali Baba cave to zk-SNARK intuition, with real Schnorr arithmetic, commitments, and replayable transcripts instead of vague metaphors.</div>
<div class="project-meta">
<div class="stack">
<span class="chip">Schnorr</span>
<span class="chip">SHA-256 Commitments</span>