Instant messaging services are quickly becoming the most dominant form of communication among customer around the word. Privacy has been important for the user and service provider.

1. Under the guideless:
DR.MAMATHA H.R
Associate Professor
Information Science
pesit
TEJESH S
1PI12IS421

2.  Instant messaging services are quickly becoming the most dominant form of
communication among customer around the word.
 Privacy has been important for the user and service provider.

3.  Offers end to end encryption .
 iMessage uses the APPLE PUSH
NOTIFICATION SERVICE(APNS) to
deliver text message and attachments
to users.
 When the device first registered with
apple ,a client certificate is created
and stored on the device.
 A persistent APNs connection is made
to apple over TCP port 5223.
 When TCP port 5223 is blocked ,the
APNS message stream shifts to using
TCP port 443.

4.  User action
1.start typing
2.stop typing
3.send text
4.send attachment
5.read recipient
 When TCP port 5223 is blocked ,the APNS message stream shifts to using TCP
port 443.

5. LEAKAGE:
• Data and Methodology
• Operating System
• User Action
• Message Attributes

6. • Collect Data from user actions.
• Collects 250 packets from each user on both devices and in both the direction.
• The text data is drawn from a set of over one million sentences and short phrases
in a variety of language.

7. • IOS appears to more efficiently compress the
plaintext , while OSX occupies a much larger
space.
• To identify the OS of observed devices, we use a
binomial naïve bayes classifier from the WEKA
machine learning .
• Its also possible to trace communications as it
passes through apple.

8. • We create Hash-based lookup table using each observed length in training
data as a key and store the associated class label.
• When a new packet arrives ,we check the look up table to retrieve the class
labels for its payload length.

9. • Each cluster represents a unique
character set used in language.
• Use WEKA multinomial naïve
Bayes.

10.  Classification of languages in
OSX data is better than IOS.
 OSX achieve accuracy of 95%.
 IOS achieve accuracy of 80%.