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0-click deanonymization attack targeting Signal, Discord, other platforms
Unique 0-click deanonymization attack targeting Signal, Discord and hundreds of platform - research.md
Cloudflare's Cache stores copies of frequently accessed content (such as images, videos, or webpages) in its datacenters, reducing server load and improving website performance ( https://developers.cloudflare.com/cache/). Telegram, another privacy-focused application, is completely invulnerable to this attack as (1) they use a custom in-house built protocol thats not reliant on HTTP and (2) don't rely on cloud providers like Cloudflare for caching. The attack leverages fundamental design decisions in caching and push notification systems, demonstrating how infrastructure meant to enhance performance can be misused for invasive tracking.
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