WhatsApp uses a
customized version of the open standard Extensible Messaging and Presence Protocol (XMPP).
How it
works
WhatsApp Messenger is a
cross-platform mobile messaging app which allows you to exchange messages
without having to pay for SMS. WhatsApp Messenger is available for iPhone,
BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all
message each other! Because WhatsApp Messenger uses the same internet data plan
that you use for email and web browsing, there is no cost to message and stay
in touch with your friends.
In addition to basic
messaging WhatsApp users can create groups, send each other unlimited images,
video and audio media messages.
Upon installation, it
creates a user account using one's phone number as username (Jabber ID: [phone
number]@s.whatsapp.net). While the Android version uses an MD5-hashed,
reversed-version of the phone's IMEI as
password, the IOS version doubles the phone's MAC address and MD5-hashes it.
Multimedia messages are
sent by uploading the image, audio or video to be sent to a HTTP server and then sending a link to
the content along with its Base64 encoded thumbnail
(if applicable)
WhatsApp synchronizes with
the phone's address book, so users do
not need to add contacts in a separate book. Since all users are registered
with their phone number, the software returns all WhatsApp users among one's
contacts.
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