2. Index Introduction History Protocol used Language used
Security Textsecure Mechanism when Offline Limitation
3. Whatsapp ? Is an instant messaging app for smartphone Cross
platform app, uses the internet to send text , image , location and
videos In January 2015 , whatsapp was the most globaly popular
messaging app with more than 700 million active users Available for
Android , iPhone , BlackBerry, Symbian , and Windows Phone Whatsapp
Inc. based in Mountain view , California , was acquired by Facebook
on February 19, 2014 for approx. US $22 billion
4. History Whatsapp Inc. was founded in 2009 Founded by Brian
Acton and Jan Koum , employee of Yahoo Koum immediately choose the
name whatsapp, it sound like whats up..
5. Protocol Used - XMPP XMPP Extensible messaging and presence
protocol Based on XML XMPP is based on Client server
architecture
6. XMPP architecture
7. Language - erlang Whatsapp server is implemented on erlang
Server system that do backend message routing are done in
erlang
8. Security Till May 2011, Whatsapp message were not secure
data was sent and received in plaintext On November 18, 2014, Open
Whisper System announced a partnership with Whatsapp to provide
end-to-end encryption
9. Text Secure TextSecure is a free and open-source encrypted
instant messaging application for Android It uses end-to-end
encryption Text secure uses Off-the-Record Messaging(OTR) protocol
for encryption
10. Mechanism when offline All message are queued on the server
until the client reconnect to retrieve message. Message are wiped
from the server memory as soon as the client has accepted the
message
11. Limitation Needs your phone to be on and connected to the
internet: Not completely Free No sign-out option.
