One developer claims the popular messaging application WhatsApp Messenger has encryption issues that allow hackers to read communications between users.

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The popular mobile messaging application WhatsApp Messenger has a major design flaw in its cryptographic implementation that could allow attackers to decrypt intercepted messages, according to a Dutch developer.

The problem is that the same key is used to encrypt both outgoing and incoming streams between the client and the WhatsApp server, said Thijs Alkemade, a computer science and mathematics student at Utrecht University in the Netherlands and lead developer of the open-source Adium instant messaging client for Mac OS X.

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