CypherBay

Anonymous, end-to-end encrypted communication

CypherBay is a minimalist web messenger for private communication. No registration. No accounts. No personal data.

[E2E] End-to-End Encryption

AES-256-GCM encryption with PBKDF2 key derivation. The server only sees encrypted data.

[ANON] No Identity

No login, no account, no email. Choose any alias per session.

[PRIV] No Tracking

No cookies, no analytics. All sessions auto-expire after 1 hour.

[LIVE] Real-Time Chat

Typing indicators, sound notifications, and live message delivery.

[SHARE] Easy Sharing

QR codes and direct links for quick session sharing. No app required.

[HOST] Self-Hosting

All code is open source and can be self-hosted on any PHP server.

System Limitations

  • Metadata (IP address, connection times) is visible to the server
  • For maximum anonymity: use Tor Browser
  • No guarantees if your device is compromised
  • Password must be shared via a secure channel
  • File uploads to 0x0.st are not encrypted
  • Sessions expire automatically after 1 hour

CypherBay - Privacy by Design

Create New Chat

Share the Session ID and password with your conversation partners.

Scan to get the Session ID

The password is never sent to the server. It is used for encryption only.

Important: Both the Session ID and password are required to join the chat. There is no password recovery.

Join Chat

If the password is incorrect, messages will not be readable. No error message will be returned from the server.

Session:
Connecting...
[ENCRYPTED] Encryption Status

All messages are encrypted with AES-256-GCM.

The key is derived locally from your password (PBKDF2, 100k iterations).

The server cannot read the content. Your alias is visible to other participants.