New Delhi, Oct. 31 -- WhatsApp has added a new feature to secure user chat histories by introducing passkey-based encryption for chat backups. The feature, which began rolling out on Thursday, enables users to protect their backups using their phone's fingerprint, face recognition, or screen lock, rather than relying on a password or manually storing a 64-digit encryption key.

The change builds on WhatsApp's existing end-to-end encryption system, which protects personal messages and calls. Until now, users who wanted to encrypt their backups on Google Drive or iCloud had to create and manage a separate password or key.

With the new passkey option, encryption becomes tied directly to the device's existing security system, meaning a tap o...