As we all know that WhatsApp messenger is widely popular now a days and a platform which provide instant messaging over the internet or cellular internet. WhatsApp stores and keep its chat archive even after deleting those chats. According to the iOS researcher Jonathan Zdziarski, while exploring the recent images of the app, he discovered that the software stores and keep forensic trail of chat archive even after deleting those chats. Anyone can access the information with physical access to the device. The data can also be redeem with any backup systems.
Sometimes, the data considered as deleted by the app itself but because its not overwritten, still can be redeem with forensic devices. Zdziarski allocated the problem with the library used in app which is SQLite and it cannot be overwrite by default.
WhatsApp was praised for converting to default end-to-end encryption with the help of Signal protocol, this process is completed in this April. But this system only save data during transition, stop carriers and other mediator from spying on chat as they travel over the network.
The researcher found that what happens to data when it delivered to the phone, specially when it stored on the phone’s local disk or remote iCloud storage. WhatsApp chats are backed up with iCloud without any hard encryption, so it means that police could draw any conversation records with court orders, even the chat had been deleted from the app.
The main issue is that temporary communication is not temporary on disk
This news shouldn’t be disturbing for WhatsApp users, however the privacy commitment made by the company in the past will be questionable. Many of the messaging apps generate similar trails, which can be redeem with iCloud backups. “iMessage also generates forensic trails,” Zdziarski said, reached by WhizzyHub. “Signal leaves virtually none.”
The research is specially related to app’s current legal effort over encryption policy.
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