Describing basic concept and algorithms used in this decentralized application.

1. Decentralized File sharing
Group Id: 02
Sponsored By : Har i ger “yste s
Internal Guide : Prof. M. R. Khodaskar.
External Guide : Mr. Prashant Sachdev.
Pune Institute Of Computer
Technology ,Pune- 411043
Name Roll No.
Jayashree Saraf B120058624
Pooja Patil B120058607
Sharayu Shinde B120058633

2. • Presentation Overview -
lProblem Statement
lAbstract
lDetail design.
lExperimental Result
lPerformance evaluation
lTest cases
lResult analysis and conclusion
lFinal thesis
lProject Plan
Decentralized File Sharing
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3. • Problem Statement –
Developing Decentralized Distributed(P2P)
Responsive Web Application for sharing data like contact
list , files, messages, image, music etc .
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Decentralized File Sharing

4. • Abstract -
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The process of distributing various terms like things,
powers or people rather than storing it on a central
location or authority is nothing but decentralization. To
avoid central point of failure, the appli atio ’s data
must be cryptographically stored.
To create a platform which allows the user’s to share or
store their data on network without the centralized
server and can be uploaded in distributed network.
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Decentralized File Sharing

5. • File Segmentation –
The file being distributed is divided into segments called
pieces.
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Fig 2:- File Segmentation and Encryption.
Decentralized File Sharing

6. • Hashing-[SHA-256]
SHA-256 algorithm generates an unique, fixed size256-bit (32-
byte) hash.
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Fig 3:- SHA-1 Encryption Process
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Initialize
hash values Pre- processing
Spilt and
Rotation
XoR Rounding
K
Message Digest
Message
W
Decentralized File Sharing

7. •File encryption and decryption is done in order to
provide security to the user data.
•The encryption algorithm used is AES which includes the
process of encryption which provides specially derived
keys also known as round keys.
•The round keys are applied to the array of data that
holds one lock of data that is to be encrypted.
• Encryption/Decryption
• AES
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Decentralized File Sharing

8. • Project Architecture-
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Fig 7:- Project Architecture
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Encryptio
n
[AES]
Assemble
Splits
Decryption
[AES]
SHA256
SHA256
SHA256
File
File
Split1
Split2
Split n Node
Node
Node
Distributed
table
Distributed
table
Distributed
table
Decentralized File Sharing

9. 8
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lWelcome Page -

10. • User Log In -
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Decentralized
File sharingGroup id:-2

11. • Registration -
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Decentralized File Sharing

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• Upload File-
Decentralized File Sharing

13. • Uploaded Input File -
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14. • Members -
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Decentralized File Sharing

15. Testing-
Case ID Test Case
Name
Inputs Expected
Output
Actual Output Remark
1. User
registration
validation.
Enter required
information.
User should
get
registered.
User
registration is
done.
Yes
2. Invalid user
registration.
Enter invalid
field while
registration.
Message pop
up of invalid
field.
Display
message pop
up.
No
3. User log in
validation.
Enter user name
and password.
Access to user
profile.
Gives access to
user profile.
Yes
4. Invalid user log
in.
Enter incorrect
user name/
password.
Message pop
up of invalid
user name/
password.
Display
message pop
up.
No
Test cases for Module 1: User account and maintenance.
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Decentralized File Sharing

16. Test cases for Module 2: File Encryption/Decryption.
Case ID Test Case
Name
Inputs Expected
Output
Actual
Output
Remark
1. File
encryption.
Text file. File should
get
encrypted.
Encrypted
file.
Yes
2. File
decryption.
Encrypted
file.
File should
get
decrypted.
Original file. No
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17. Test cases for Module 3: Segment Files into pieces.
Case ID Test Case
Name
Inputs Expected
Output
Actual Output Remar
k
1. File
segmentatio
n.
Encrypted
Text file.
Segment
file into
pieces of
1kb each.
Segmentation
is done.
Yes
Test cases for Module 4: Distributed hash table generation.
Case ID Test Case
Name
Inputs Expected
Output
Actual Output Remar
k
1. DHT
generation.
A Segment of
file.
Distributed
hash
generated
for each
hash.
Distributed
hash is
generated.
Yes
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18. • Future Work-
1.Creating digital coins.
1.Maintaining Wallet for User’s Coin.
1.Convert Coins into User’s suitable currency.
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19. B
Segment file
into piece of
size 16-bits
17.5
A
User account and
maintenance
10.33
C
Encryption/decryp
tion of pieces of
file
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D
Distributed
hash table using
Pastry
22.83
E
Block-Chain
based network
for managing
transaction
records
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20. Thank
You

21. Any
Questions