“Message encrypted” means end-to-end encryption protects the message so only you and the recipient can read it.
Meaning
Message encryption (end-to-end encryption) means only the sender and recipient can read the messages. Even the company can’t read them.
Where
WhatsApp, Signal, iMessage and Facebook Messenger (default since 2023).
How
Messages are scrambled with keys stored on devices.
Limits
Encryption doesn’t protect against someone with your phone.
Verify
Compare the security code.
Backups
May not be encrypted.
What encryption means in practice
A message labeled encrypted is scrambled so only the sender and recipient can read it. End-to-end encryption (E2EE), used by Signal, WhatsApp and iMessage between Apple devices, means that even the service cannot read the content. Messages use cryptographic keys, with algorithms such as AES-256 for content and Curve25519 for key exchange in the Signal Protocol.
- Transport encryption (TLS) protects data in transit, but the provider may read it on its servers.
- WhatsApp enabled E2EE by default for all users in 2016.
- SMS and standard email are generally not end-to-end encrypted.
Limits and verification
Encryption does not hide metadata such as who contacts whom and when, and does not protect against someone with access to your unlocked phone or backups. Cloud backups may not be encrypted unless you enable it. Verify contacts by comparing safety numbers or QR codes in the app. Keep apps updated, and use a strong device passcode.
What encryption means in practice
A message labeled end to end encrypted can be read only by the sender and recipient, not by the service. Apps such as Signal, WhatsApp and iMessage use end to end encryption. The Signal Protocol uses key exchange and ratcheting so each message uses a new key.
Limits and verification
Encryption does not hide metadata like who talked to whom, and does not protect messages if the device is compromised or backups are unencrypted. Compare safety numbers or QR codes to verify contacts. Standard SMS is not encrypted.
Encryption in major apps
iMessage between Apple devices, WhatsApp, Signal and Facebook Messenger (default since 2023) use end to end encryption. WhatsApp has over 2 billion users. Telegram default chats are not end to end encrypted, only secret chats. Standard email and SMS are not end to end encrypted.
Security practice
Verify contacts with safety numbers, use disappearing messages, enable two step verification, keep software updated and be careful with backups. In iCloud, Advanced Data Protection encrypts backups end to end. Encryption does not stop screenshots, phishing or someone who has your unlocked phone. Law enforcement may access metadata with legal process.
Based on data from the Electronic Frontier Foundation, WhatsApp and Apple Support
