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WhatsApp Rolls Out Lockdown-Style Security Mode to Protect Targeted Users From Spyware. Meta on Tuesday announced it's adding Strict Account Settings on WhatsApp to secure certain users against advanced cyber attacks because of who they are and what they do. The feature, similar to Lockdown Mode in Apple iOS and Advanced Protection in Android, aims to protect individuals, such as journalists or public-facing figures, from sophisticated spyware by trading some functionality for enhanced security. Once this security mode is enabled, some of the account settings will be locked to the most restrictive options, while simultaneously blocking attachments and media from people not in a user's contacts. "This lockdown-style feature bolsters your security on WhatsApp even further with just a few taps by locking your account to the most restrictive settings like automatically blocking attachments and media from unknown senders, silencing calls from people you don't know, and restricting other settings that may limit how the app works," Meta said. The feature can be enabled by navigating to Settings > Privacy > Advanced. Meta said the feature is rolling out gradually over the coming weeks. In tandem, the social media giant said it's adopting the use of the Rust programming language in its media sharing functionality to help keep users' photos, videos, and messages safe from spyware attacks. It described the development as the "largest rollout globally of any library written in Rust." The company also said the use of Rust made it possible to develop a secure, high-performance, cross-platform library ("wamedia") for media sharing in WhatsApp across devices, adding it's investing in a three-pronged approach to combat memory safety issues - "WhatsApp has added protections like CFI, hardened memory allocators, safer buffer handling APIs, and more," the company said. "This is an important step forward in adding additional security behind the scenes for users and part of our ongoing defense-in-depth approach."