Files
securebit-chat/index.html
T
lockbitchat 7b703e4e65 feat(handshake): in-band key exchange; SBQ2 live in the connection path; release v5.9.0
The descriptor no longer carries key material. It carries what brings up DTLS
plus a 16-byte commitment; the ECDH and ECDSA public keys travel as the first
frame on the DataChannel and are checked against that commitment BEFORE they are
parsed or imported. Measured on the live site, the invitation went from 2274
characters across 4 animated QR frames to 151 characters in one frame.

What the split buys is that nothing is trusted on the strength of having
completed a handshake. The fingerprint arrives over the channel the user
authenticated by looking at it, so DTLS completes only with whoever showed the
code; the commitment makes substituted key material fail closed automatically
instead of relying on the human comparison; and the SAS is computed over a
transcript covering both descriptors verbatim and both key blobs, so anything an
attacker can change anywhere in the handshake changes the digits.

Consequences for the rest of the crypto:

- the HKDF salt is derived from the transcript rather than transmitted, binding
  every session key to both DTLS fingerprints and every candidate;
- authProof is replaced by one ECDSA signature over the transcript, proving the
  same possession without echoing a nonce back across seven fields;
- Double Ratchet support is implied by the format rather than advertised in it.
  SBQ2 postdates the ratchet, so the "peer is old, fall back to static keys"
  branch is unreachable here -- it used to fire silently, since SBQ2 has no `dr`
  field for _initializeRatchet to find.

Fail closed throughout. _handshakeMode is latched per connection, so a session
cannot be pushed back onto SB1 halfway through; commitment mismatch, wrong role,
duplicate blob, bad proof and timeout all tear the connection down with a
specific message rather than degrade. SBQ2 handshake frames are refused outright
on a non-SBQ2 session, where there would be no commitment to check them against.

Reception of both formats is unconditional and split by first byte (0x02 vs
ASCII 'S') and text prefix. SBQ2_SEND_ENABLED is the single value that governs
what we emit; flipping it to false and redeploying reverts new invitations to
SB1, and the animated multi-frame QR path stays for them.

Verified end to end in real browsers -- 12/12 across {Chrome, Firefox} squared
and three network profiles -- through to a confirmed SAS, an active ratchet, a
64-byte transcript-derived salt and a decrypted message on the far side.
2026-08-06 18:20:48 -04:00

230 lines
21 KiB
HTML

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, interactive-widget=resizes-content">
<meta http-equiv="Content-Security-Policy"
content="default-src 'self';
script-src 'self';
style-src 'self' 'unsafe-inline';
font-src 'self' data:;
connect-src 'self' stun: stuns: turn: turns:;
img-src 'self' data:;
media-src 'self' blob:;
object-src 'none';
frame-src 'none';
worker-src 'self';
manifest-src 'self';
form-action 'self';
base-uri 'none';
upgrade-insecure-requests;">
<meta http-equiv="X-Content-Type-Options" content="nosniff">
<meta http-equiv="X-XSS-Protection" content="1; mode=block">
<meta http-equiv="Referrer-Policy" content="strict-origin-when-cross-origin">
<!-- PWA Manifest -->
<link rel="manifest" href="./manifest.json">
<link rel="icon" type="image/x-icon" href="./logo/favicon.ico?v=1786054741114">
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<meta name="mobile-web-app-capable" content="yes">
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<meta name="format-detection" content="telephone=no">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="apple-mobile-web-app-title" content="SecureBit">
<meta name="application-name" content="SecureBit">
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<meta name="msapplication-config" content="./browserconfig.xml">
<!-- Theme colors -->
<meta name="theme-color" content="#ff6b35">
<meta name="msapplication-navbutton-color" content="#ff6b35">
<!-- Security Headers for PWA - CSP is already defined above -->
<!-- SEO -->
<title>SecureBit.chat — Private, Encrypted Messenger</title>
<meta name="description" content="SecureBit.chat is a free, end-to-end encrypted peer-to-peer messenger that runs entirely in your browser. No accounts, no servers storing your messages — ECDH P-384, AES-256-GCM and in-person SAS verification.">
<meta name="keywords" content="encrypted messenger, end-to-end encryption, peer-to-peer chat, P2P messenger, ECDH, DTLS, SAS verification, WebRTC, private chat, secure chat, no servers, no accounts, MITM protection, PFS">
<meta name="author" content="Volodymyr">
<meta name="robots" content="index, follow, max-image-preview:large, max-snippet:-1">
<link rel="canonical" href="https://securebit.chat/">
<!-- Open Graph -->
<meta property="og:site_name" content="SecureBit.chat">
<meta property="og:title" content="SecureBit.chat — End-to-End Encrypted Peer-to-Peer Chat">
<meta property="og:description" content="A secure messenger that runs entirely in your browser. No accounts, no servers storing your messages. Bring your own STUN/TURN servers — we don't impose anything.">
<meta property="og:url" content="https://securebit.chat/">
<meta property="og:type" content="website">
<meta property="og:locale" content="en_US">
<meta property="og:image" content="https://securebit.chat/assets/social-card.png">
<meta property="og:image:secure_url" content="https://securebit.chat/assets/social-card.png">
<meta property="og:image:type" content="image/png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="SecureBit.chat — end-to-end encrypted, peer-to-peer chat">
<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="SecureBit.chat — End-to-End Encrypted Peer-to-Peer Chat">
<meta name="twitter:description" content="A secure messenger that runs entirely in your browser. No accounts, no servers storing your messages.">
<meta name="twitter:image" content="https://securebit.chat/assets/social-card.png">
<meta name="twitter:image:alt" content="SecureBit.chat — end-to-end encrypted, peer-to-peer chat">
<!-- Structured data (schema.org) -->
<script type="application/ld+json">
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebSite",
"@id": "https://securebit.chat/#website",
"name": "SecureBit.chat",
"url": "https://securebit.chat/",
"description": "End-to-end encrypted, peer-to-peer chat that runs entirely in your browser.",
"inLanguage": "en"
},
{
"@type": "WebApplication",
"name": "SecureBit.chat",
"url": "https://securebit.chat/",
"applicationCategory": "CommunicationApplication",
"operatingSystem": "Any (modern web browser)",
"browserRequirements": "Requires WebRTC and the Web Crypto API",
"description": "A free, end-to-end encrypted peer-to-peer messenger. No accounts, no servers storing messages — ECDH P-384, AES-256-GCM and in-person SAS verification.",
"image": "https://securebit.chat/assets/social-card.png",
"license": "https://opensource.org/licenses/MIT",
"isAccessibleForFree": true,
"offers": { "@type": "Offer", "price": "0", "priceCurrency": "USD" },
"featureList": [
"End-to-end encryption (ECDH P-384, AES-256-GCM)",
"Peer-to-peer WebRTC connection with no message servers",
"In-person SAS verification against man-in-the-middle attacks",
"Custom STUN/TURN servers and relay-only privacy mode",
"Encrypted file transfer",
"Installable Progressive Web App with offline support"
],
"sameAs": [ "https://github.com/SecureBitChat/securebit-chat" ]
}
]
}
</script>
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