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http://www.whatsapp.com/faq/en/general/21864047 http://www.whatsapp.com/faq/en/general/21864047 - from their FAQ

• skeg 13y ago
  WhatsApp communication between your phone and our server is encrypted. ... Please be aware of who has physical access to your phone.
  • bennyg 13y ago
    Well yeah, encrypted with one AES key per user. That shit isn't secure.