Client server computing in mobile environments part 2

Three-Party Authentication using
Quantum Key Distribution Protocols
By,
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Guided By : Mr. xxxxxxxxxxx.,

Abstract
This project presents Quantum Key Distribution
Protocols (QKDPs) to safeguard security in large
networks, by using DES algorithm for encryption and
decryption of .txt file.
 In this project, secure communication between the
sender and the receiver is being made possible through a
trusted center by using secret key authentication.


Abstract continued…
The Trusted Center distributes a quantum key to both
the sender and the receiver after the verification of the
secret key.
 The sender encrypts the data and sends to the receiver
side only after obtaining the quantum key from the
Trusted Center.
 Similarly the decryption process occurs. RSA algorithm
is being used for quantum key distribution. Finally the
input .txt file is retrieved on the receiver side.


Existing System


In classical cryptography, three-party key distribution
protocols utilize challenge response mechanisms or
timestamps to prevent replay attacks .



However, challenge response mechanisms require at
least two communication rounds between the TC and
participants.

Demerits of Existing System


The timestamp approach needs the assumption of clock
synchronization which is not practical in distributed
systems.



Furthermore, classical cryptography cannot detect the
existence of passive attacks such as eavesdropping.

Proposed System


In quantum cryptography, quantum key distribution protocols
(QKDPs) employ quantum mechanisms to distribute session keys
and public discussions to check for eavesdroppers and verify the
correctness of a session key.



However, public discussions require additional communication
rounds between a sender and receiver and cost precious qubits. By
contrast, classical cryptography provides convenient techniques that
enable efficient key verification and user authentication.



The advantages of both the classical and quantum cryptography are
utilized in the proposed QKDP.

Working Principle





In Proposed System, the sender and the receiver preshared their
secret key to the Trusted Center (TC).
In Trusted Center session key is generated by using secret key
and random string then quantum key is generated through qubit
generation.
To generate the quantum key using the qubit and the session key
which depends on the qubit combination such as,
1. If the value is 0 and 0, then 1/0.707(p[0]+p[1])
2. If the value is 1 and 0, then 1/0.707(p[0]-p[1])
3. If the value is 0 and 1, then p[0]
4. If the value is 1 and 1, then p[1]

System Requirements
Hardware Requirements
Processor
 RAM capacity
 Hard Disk


-

Intel Pentium III
128 MB
40 GB

Software Requirements
Operating System
 Front End
 Back End


-

Windows XP
Visual C# .Net
SQL Server 2000

List of modules
1.

Sender Module.

2.

Trusted Center Module and

3.

Receiver Module.

Module Description
Sender Module
This module has three sub-modules. They are,
1. Registration
2. Login
3. Send data

Modules Continued…
Trusted Center Module


Secret Key Verification



Session Key Generation



Qubit Generation



Quantum Key Generation



Key Distribution

Modules Continued…
Receiver Module
This module has three sub-modules. They are,
1. Registration
2. Login
3. Receive data

Use case Diagram – Quantum key
Generation

Algorithms


For Encryption & Decryption, DES algorithm is used.



For key Generation RSA algorithm is used, the
algorithms are explained as,

RSA algorithm
Key Generation
1. Select p ,q where both p and q both prime, p≠q
2. Calculate n=p*q
3. Calculate Ø(n)=(p-1)(q-1)
4. Select integer e where gcd (Ø(n),e)=1; 1<e<Ø(n)
5. Calculate d where d= e^-1 mod Ø(n)
6. Public key KU={e ,n}
7. Private key KR={d ,n}

Secret key Generation - Sender

Secret Key Generation - Receiver

Quantum Key Generation (After
both sender and receiver logged in)

Path name of the .txt file and the Ip
address of the local system

Conclusion
Compared with classical three-party key distribution
protocols, the proposed QKDPs easily resist replay and
passive attacks.
 Compared with other QKDPs, the proposed schemes
efficiently achieve key verification and user authentication
and preserve a long-term secret key between the TC and each
user.
 Additionally, the proposed QKDPs have fewer
communication rounds than other protocols. Although the
requirement of the quantum channel can be costly in practice,
it may not be costly in the future.
 Moreover, the proposed QKDPs have been shown secure
under the random oracle model. By combining the advantages
of classical cryptography with quantum cryptography, this
work presents a new direction in designing QKDPs.


Future Enhancements
The whole project can be enhanced for secure
communication between two systems in a local area
network through the trusted center which can be a third
system in the local area network.
 The communication round between the sender and the
receiver becomes one by applying this project as well as
secret key authentication is being provided by the
trusted center which in turn generates the quantum key.


References


G. Li, “Efficient Network Authentication Protocols:
Lower Bounds and Optimal Implementations,”
Distributed Computing, vol. 9, no. 3, pp. 131-145, 1995.



A. Kehne, J. Schonwalder, and H. Langendorfer, “A
Nonce-Based Protocol for Multiple Authentications,”
ACM Operating Systems Rev., vol. 26, no. 4, pp. 84-89,
1992.



M. Bellare and P. Rogaway, “Provably Secure Session
Key Distribution: The Three Party Case,” Proc. 27th
ACM Symp. Theory of Computing, pp. 57-66, 1995.

Client server computing in mobile environments part 2

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