Encrypted Chat Room Guide: Truly Private Conversations Even the Server Can't Read

When most messengers claim to offer "private conversations," the messages are usually still stored on their servers. If server data is exposed through a court order or a hack, your conversations can be revealed.

LOCK.PUB's encrypted chat rooms are different. With end-to-end encryption (E2E), only encrypted data is stored on the server, and only participants who know the password can decrypt the content. Not even the server operators can read your conversations.

How Does It Work?

Encryption Mechanism

sequenceDiagram
    participant A as Participant A (Browser)
    participant S as Server
    participant B as Participant B (Browser)
    A->>A: AES encryption (password)
    A->>S: Send encrypted message
    Note over S: Only ciphertext stored<br/>Content unreadable
    S->>B: Deliver encrypted message
    B->>B: AES decryption (same password)

The password is never sent to the server. Only the SHA256 hash of the password is used for authentication, while the original password is used exclusively in the browser for encryption and decryption.

How to Use

1. Create a chat room -- Set a password and create the room
2. Share the link -- Send the chat room link to participants
3. Share the password -- Send the password through a separate channel
4. Start chatting -- Participants enter the password and can start chatting immediately

Chat Room Features

Complete Anonymity

Anyone can join without signing up. Participants choose their own nickname and are assigned a random color. No IP addresses or personal information are collected.

End-to-End Encryption

All messages are protected with AES encryption. Not only the message content, but also nicknames and color information are encrypted together.

flowchart LR
    subgraph Encrypted
        A[Message text]
        B[Participant nickname]
        C[Participant color]
    end
    subgraph Not encrypted
        D[Timestamp]
    end

Real-Time Chat

Messages are delivered instantly using Firestore's real-time synchronization. New messages appear automatically without needing to refresh.

Message History

When you enter a chat room, the most recent 50 messages are displayed. Scroll up to load older messages.

When to Use It

Sensitive Business Discussions

Use it for project discussions with confidentiality concerns, HR-related conversations, contract negotiations, and more. When the conversation is over, simply let the chat room expire.

Anonymous Feedback Collection

Perfect for getting honest feedback from team members. Since participation is anonymous, people can share their true opinions freely.

Emergency Information Exchange

Quickly share access credentials or recovery codes during emergencies like server outages.

Secret Event Planning

Use it for planning surprise parties, gifts, or any conversation that the intended person shouldn't see.

Security Tips

Password Strength

The security of the chat room depends on the password strength, as it serves as the AES encryption key.

• 1234 -- Too weak
• password -- Too guessable
• TeamMeeting-Feb! -- A combination only participants would know
• Project-X-2026#Feb -- Sufficiently complex

Expiration Time (Pro)

With the Pro plan, you can set an expiration time for chat rooms. Leaving a chat room active after the conversation ends is a security risk, so set an appropriate expiration time:

Use Case	Recommended Expiration
Emergency info exchange	1 hour
One-time meeting discussion	24 hours
Project-duration conversation	7 days

Comparison with Regular Messengers

	KakaoTalk	Telegram Secret Chat	LOCK.PUB Chat Room
Plaintext stored on server	Yes	No	No
Signup required	Yes	Yes	No
Personal data collected	Yes	Yes (phone number)	No
Auto-expiration	No	Available	Yes (Pro)
Anonymous participation	No	No	Yes
Works in browser only	No	Partial	Yes

Free vs Pro

	Free	Pro
Chat room creation	15/month (all types combined)	Unlimited
Messages	50 per room	Unlimited
Expiration time	No	Yes
Message length	200 characters	200 characters

Get Started

Encrypted chat rooms are free to create. Use them right in your web browser -- no app installation needed.

Create an Encrypted Chat Room ->