iMessage, Hangouts, Skype, Telegram, Signal, WhatsApp are familiar, while PalTalk, Pigin, Psi Jabber client, Gadu-Gadu, Gajim, Trillian, BigAnt or Brosix are relatively little known. The tools from the first group are not only more popular but infinitely more secure compared to the tools from the second group. In this publication we’ll review the authentication methods used by the various instant messengers, and attempt to extract a password to the user’s account.

In today’s world of everyone wanting a slice of one’s personal information, users become more and more concerned about the privacy. The WhatsApp/Facebook integration raised an additional concern, considering that Facebook-owned Messenger requests the largest number of invasive permissions among all commonly used messengers. Data privacy and security concerns are mounting like a snowball. 2020 brought multiple data breach incidents from popular blogging resources from LiveJournal whose users’ data was breached and leaked to the darknet to financial institutions like Postbank with 12M exposed credit cards, hospitality giants as Mariott with 383 million records compromised or even Microsoft customers who also suffered from privacy-related issues.

With nearly half a billion users, Telegram is an incredibly popular cross-platform instant messaging app. While Telegram is not considered the most secure instant messaging app (this title belongs to Signal), its conversation histories do not appear in either iTunes or iCloud backups. Moreover, Telegram secure chats are not stored on Telegram servers. As a result, Telegram secret chats can be only extracted from the device of origin. Learn how to extract and analyse Telegram secret chats from the iPhone file system image.

Instant messaging apps have become the de-facto standard of real-time, text-based communications. The acquisition of instant messaging chats and communication histories can be extremely important for an investigation. In this article, we compare the five top instant messaging apps for iOS in the context of their forensic analysis.