This document proposes an improved privacy-preserving peer-to-peer multimedia distribution system based on recombined fingerprints. The system aims to allow for legal distribution of multimedia contents while preserving the privacy of both senders and receivers. It uses recombined fingerprints, which are divided into segments and recombined for each new buyer based on their parents' fingerprints, providing a more efficient and practical traitor tracing protocol while guaranteeing buyers' frameproofness. The real identities of buyers are only known by the merchant to ensure privacy and trace illegal redistribution when needed.

1. IMPROVED PRIVACY-PRESERVING P2P
MULTIMEDIA DISTRIBUTION
BASED ON RECOMBINED
FINGERPRINTS
Domain : Secure computing
Guide: Varija Madam
Vaishali Misra
Laxmi Praythusha
Y. Praythusha
Sai Chandra

2. OBJECTIVE
 Legal distribution of multimedia contents .
 Preserve the privacy of both the sender and
receiver.
 Usage of Recombined fingerprints which are more
secured.
 Trace the illegal re-distribution of contents.

3. INTRODUCTION
 Computer security is information security as
applied to computers and networks.
 Anonymous fingerprint has been suggested as a
convenient solution for the legal distribution of
multimedia contents with copyright protection.
 Recombined fingerprint approach results in an
efficient privacy-preserving and P2P-based
fingerprinting system.

4. EXISTING SYSTEM
 Symmetric scheme: Merchant will have
fingerprinted copy, the buyer wont be accused of ill-
legal distribution.
 Asymmetric scheme: merchant does not have
access to the fingerprinted copy, but he can recover
in case of illegal redistribution.
 Anonymous scheme: The buyer preserves her
anonymity and cannot be linked to the purchase of
a specific content, except if she participates in an
illegal redistribution.

5. DISADVANTAGES
 Developing a practical system using this idea
appears difficult.
 Homo-morphic encryption.
 Implementation is not simple and requires complex
protocol.

6. PROPOSED SYSTEM
 The content is divided into several ordered
fragments called segment.
 The merchant distributes different copies to a
reduced set of M seed buyers.
 The buyers other than the seed ones engage on
P2P transfers of the content.
 The fingerprint of each new buyer is built as a
recombination of the segments of its parents.

7.  A transaction record is created by a transaction
monitor to keep track of each transfer between peer
buyers.
 The fingerprint’s hashes are encrypted in such a
way that the private key of at least one parent is
required for obtaining their clear text.
 The real identities of buyers are known only by the
merchant.

8. ADVANTAGES
 A more efficient and practical system, especially as
traitor tracing protocol.
 Buyers frameproofness is guaranteed.
 Encryption is only for short bit strings, such as the
binary fingerprints and hashes, not to the content.

9. SYSTEM DESIGN
 The system design should focus on the amount of
input required, controlling the errors, avoiding delay.
 A quality output is one, which meets the
requirements of the end user and presents the
information clearly.
SYSTEM CONFIGURATION:
 Operating system : Windows XP.
 Coding Language: JAVA
 Data Base : MYSQL

10. SYSTEM ARCHITECTURE

11. DATAFLOW DIAGARAM

12. USE CASE DIAGRAM

13. CLASS DIAGRAM

14. SEQUENCE DIAGRAM

15. ACTIVITY DIAGRAM

16. MODULES
 Merchant: He distributes copies of the content legally to
the seed buyers.
 Buyer’s privacy:The identity of a buyer who has
purchased a specific content could be revealed by a
coalition of two parties.
 Transaction monitor: It keeps a transaction register for
each purchase carried out for each buyer.
 Database authentication attacks : An attacker may try to
obtain the fingerprint of a buyer that is stored in the
transaction monitor’s database.

17. SYSTEM TESTING
 Unit testing
 Integration testing
 Function testing
 System test
 White box testing
 Black box testing

22. CONCLUSION
 Recombined fingerprint strategy provides more
security.
 Buyers need not to compromise their privacy.
 Recombined fingerprint strategy for data transfer
relates with the real time scenarios as the DNA
fingerprints.

23. REFERENCE
 David Megıas, “Improved Privacy-Preserving P2P
Multimedia Distribution Based on Recombined
Fingerprints”, IEEE TRANSACTIONS ON
DEPENDABLE AND SECURE COMPUTING,
VOL. 12, NO. 2, MARCH/APRIL, 2015.