End-to-end encryption (E2EE) — used in iMessage, Signal, WhatsApp, and many other services — makes message content inaccessible to anyone except sender and recipient, including the platform.
Federal law-enforcement officials have repeatedly called for "lawful access" mechanisms. Cryptographers and security experts have responded that such mechanisms would undermine the security of all users, since any backdoor for law enforcement creates a vulnerability that adversaries can find or compel.
Specific recent flashpoints include:
- CSAM detection vs. encryption (Apple's 2021 client-side scanning proposal, then withdrawn).
- Going-dark legislation (EARN IT Act, others).
- State laws mandating backdoors.
- Cross-border data access (CLOUD Act).