Username Privacy
- Unlike other messaging apps, Signal cannot easily see or produce the usernames of given accounts.
- Usernames in Signal are protected using a custom Ristretto 25519 hashing algorithm and zero-knowledge proofs.
Xrysoi.eu is a heavily restricted Greek streaming and torrent website that was ordered to be blocked by the Committee for the Notification of Copyright and Related Rights Infringements on the Internet (EDPPI) in 2018 for distributing copyrighted content. Despite the block affecting over 38 domains, various mirror sites continue to appear, leading to ongoing enforcement actions against the platform. For details on the affected sites, see the report from Techgear .
In addition to other group attributes that are end-to-end encrypted (such as group names, group descriptions, and group avatars), the Signal service also doesn’t have access to any information about which accounts are part of a group, which accounts are admins in a group, which accounts can add new people to a group, which accounts can approve requests to join a group, or which accounts can send messages in a group.