Traces of WhatsApp data lingers after deletion on iOS
WhatsApp's end-to-end encryption is not as secure as promised on Apple's iPhone, but researcher says "do not panic"
Earlier this year WhatsApp strengthened its default encryption on its messaging service, however a researcher has revealed that the service is not as secure as it aims to be.
Security researcher Jonathan Zdziarski discovered that the latest version of WhatsApp for Apple's iOS leaves some WhatsApp data open and vulnerable. He found that though the messages are deleted, they not only remain for months but also leave a forensic trace enabling anyone with access to the phone or backed up messages stored in the cloud to retrieve conversations, even if archived.
Zdziarski revealed that users are only able to overcome the problem by deleting WhatsApp from the phone to remove old messaged and reinstalling it again.
Zdziarski previously disclosed that Apple's iMessenger also has the same problem. The problem stems from the SQLite library which is used to build apps, however it doesn't overwrite the data until it is overwritten with new data.
Though WhatsApp or Facebook have not yet commented, Zdziarski reassures WhatsApp users that they do not need to panic but should be aware.