The Texas Attorney General filed a lawsuit against Meta in May, alleging that the company misrepresented the security provided by WhatsApp’s end‑to‑end encryption. In parallel, Apple and Google announced that rich‑text messaging between Android and iOS devices will now support end‑to‑end encryption, provided users enable the RCS feature on their phones.
RCS encryption applies only to messages sent through the RCS protocol; traditional SMS and MMS remain unencrypted. Similarly, Telegram encrypts messages by default only in transit, and true end‑to‑end encryption requires initiating a “Secret Chat” for each conversation.
End‑to‑end encryption scrambles message content on the sender’s device and allows only the intended recipient, who holds the matching decryption key, to restore the original text. This design prevents intermediaries, including the service provider, from reading message contents.
While E2EE secures the message body, it does not conceal associated metadata such as sender and receiver identities, timestamps, or geolocation data. Consequently, observers can still infer communication patterns despite the content remaining unreadable.
Cloud backups introduce another vulnerability: when messages are stored on services like Google Drive or iCloud, they are decrypted during transit and may be accessed without the original encryption keys. Users must enable additional safeguards to protect backup data.
Implementation varies across platforms. WhatsApp applies E2EE to all chats by default but leaves backups unencrypted. Telegram offers optional “Secret Chats” for true E2EE, while its standard chats and group channels lack this protection. Signal provides comprehensive encryption for individual and group messages, as well as minimal metadata retention.
WhatsApp’s backup process currently exposes messages briefly while uploading to third‑party cloud storage, creating a window for potential interception. No evidence confirms that the company reads these backups, but the risk remains without user‑enabled encryption.
Telegram encrypts messages in transit and at rest, yet retains decryption keys for standard chats. Only “Secret Chats” generate unique keys that prevent the platform from accessing content, and group chats do not benefit from end‑to‑end encryption at all.
iMessage encrypts iPhone‑to‑iPhone messages by default, but iCloud backups store the decryption key alongside the data, allowing Apple to decrypt messages if required. Enabling “Advanced Data Protection” extends end‑to‑end encryption to iCloud backups, mitigating this exposure.
Signal stands out for encrypting every aspect of communication, including sender identities and group metadata, and for maintaining minimal server logs. Legal challenges have shown that the platform can comply with subpoenas while revealing little usable information.
Common limitations persist across most messaging services: metadata collection, susceptibility to device‑level attacks such as spyware or zero‑click exploits, and reduced security in multi‑participant group chats. These factors can undermine the privacy guarantees of end‑to‑end encryption.
Users seeking stronger privacy should activate encrypted backups on WhatsApp, enable Advanced Data Protection for iMessage, and consider adopting Signal for sensitive conversations. Additional measures such as disappearing messages and verification of security codes further reduce the risk of interception.
