
With over 3 billion users globally, mobile instant messaging apps have become indispensable for both personal and professional communication. Besides plain messaging, many services implement additional features such as delivery and read receipts informing a user when a message has successfully reached its target. This paper highlights that delivery receipts can pose significant privacy risks to users. We use specifically crafted messages that trigger delivery receipts allowing any user to be pinged without their knowledge or consent. By using this technique at high frequency, we demonstrate how an attacker could extract private information such as the online and activity status of a victim, e.g., screen on/off. Moreover, we can infer the number of currently active user devices and their operating system, as well as launch resource exhaustion attacks, such as draining a user's battery or data allowance, all without generating any notification on the target side. Due to the widespread adoption of vulnerable messengers (WhatsApp and Signal) and the fact that any user can be targeted simply by knowing their phone number, we argue for a design change to address this issue.
Greetings Programs!! It's release day for @pidgin 3.0 Alpha 1 and we've gotta a lot of stuff to do for it! Come on by!!
Je suis rendu à 869 abonnés sur TikTok https://tozounoir.zouluvo.com/je-suis-rendu-a-869-abonnes-sur-tiktok/
#réseauxsociaux #créationdecontenu #TikTok #YouTube #abonnés #vues #motivation #objectifs #progression #créativité #vidéo #montage #audience #engagement #algorithme #succès #persévérance #passion #chat #contenuanimalier #influenceur #communauté #croissance #publication #inspiration #travailenligne #monétisation #patience #énergie #determination
Who is ready for ircpuzzles???
We'll be starting at 12:00 UTC on 2026-04-01
#ircpuzzles #IRC #puzzle #puzzles #InternetRelayChat #chat #Libera #LiberaChat @liberachat #Internet
Welcome to #ircpuzzles! We are an IRC-based puzzle game. Our home is currently in #ircpuzzles on Libera.Chat We host the annual April Fool's Puzzle and Challenges every year on April 1st as part of our celebration for April Fool's Day. Answers are keys to channels and individuals progress from …
Pax, our very tired birthday girl, is heading to Lullaby Land. 🥱💤
Good night, or good day, to all our Mastodon and Fediverse friends! We hope a special kindness will brighten your outlook. Please take care of your own welfare, and that of your family and neighbors.💖
#Pax #CatsOfMastodon #CatsOfFediverse #Cats #Cat #Catstodon #MastoCats #FediCats #Pets #Animals #Birthday #Chat #Gatos #Katzen #Katze #AdoptDontShop
Asked once before and only got 1 or 2 positive responses - if I started a Hexbear recovery group, any interest?