What is Disappearing Messages?
A messaging feature that automatically deletes messages after a set time period, reducing the risk of data exposure if a device is compromised.
Disappearing messages provide automatic data minimization for conversations.
How They Work
- Sender sets a timer (seconds to weeks)
- After the timer expires, messages are deleted from both devices
- Deletion happens automatically without user intervention
Available In
- Signal: Configurable per-conversation, 1 second to 4 weeks
- WhatsApp: 24 hours, 7 days, or 90 days
- Telegram: Secret chats with custom timers
- Wire: Configurable timers
What They Don't Protect Against
- Screenshots (the recipient can always capture the screen)
- Photos of the screen
- Forwarding/copying before deletion
- Device forensics before deletion occurs
When to Use
Disappearing messages should be the default for most conversations. You rarely need a permanent record of casual messages, and every message stored is a message that could be exposed in a breach, seized device, or legal discovery.
Related Terms
End-to-End Encryption
A method of secure communication where only the communicating users can read the messages. In principle, it prevents potential eavesdroppers – including telecom providers, Internet providers, and even the provider of the communication service – from being able to access the cryptographic keys needed to decrypt the conversation.
Forward Secrecy in Messaging
A property of messaging protocols where each message uses a unique encryption key, so compromising one key doesn't expose past or future messages.
Operational Security
The practice of protecting sensitive information by thinking like an adversary to identify vulnerabilities in your own behavior and communications. OPSEC goes beyond technical tools to address human factors that could expose you.
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