SPRING 2020
APT3090 CRYPTOGRAPHY AND NETWORK SECURITY
IMPLEMENTATION OF RSA OVER TCP
15 Marks
Group Project: Maximum 4 Members per group
15 Marks
Purpose:
1) Write a program to implement RSA algorithm with key size 1024 bits.
2) After public key and private key been generated, use Alice/Bob application over TCP to demonstrate
encryption and decryption process. Sockets provide the communication mechanism between two
computers using TCP. TCP is a two-way communication protocol.
Methods:
The program consists of two classes one is Alice which present the one who generate the public key pair
and send the public key to Bob through TCP socket, then decrypt the ciphertext received from Bob.
The other one is Bob who will use the public key to encrypt the message and send the ciphertext to Alice
for decryption. . The input p and q should be generated by random numbers program
To encrypt a message, M, with the public key, create the ciphertext, C, using the equation: C =
Me mod n
The receiver then decrypts the ciphertext with the private key using the equation: M =
d
C mod n
In Alice:
1) Generate a BigInteger p which has bit length 512, prime certainty 1-1/2^50. The p is generated using
SecureRandom object that has seed provided by Sun. corp.
2) Generate q the way as p.
3) Calculate p * q = n and ( p-1)*(q-1)
4) After public key n and private key d have been generated, if user click “send” the program will create
a TCP socket with hostname and port number and send the public key to Bob.
5) Create ServerSocket to wait for client and create a Socket for the connection to receive the ciphertext
from Bob.
6) Read ciphertext c from TCP socket and calculate plaintext m using d
In Bob:
1) Create ServerSocket to wait for client and create a Socket for the connection to receive the public key
from Alice.
After the user key in the plaintext and click “send”, calculate the ciphertext using public key n , e and
modPow function of BigInteger. Create
SPRING 2020
APT3090 CRYPTOGRAPHY AND NETWORK SECURITY
LICENSES MANAGER GROUP PROJECT
15 Marks
Group Project: Maximum 4 Members per group
Phase 1
Licenses Manager is a powerful yet easy-to-use platform which allows organizations to
accurately manage software licenses for specific devices and default accounts. License Manager
ensures an organization is tracking the usage of software licenses and administrator passwords
for various hardware. End users (customers) are able to access software licenses codes for
various application software’s, renewal dates contact that person.
a)
b)
c)
d)
a)
b)
c)
d)
e)
f)
Database normalization
Provide a schema showing relationship of tables in 3NF.
Identify sensitive, confidential and public information
Identify users access levels ( Who should Select,Insert,Delete,Update)
Develop a License manager web application
Write scripts to insert and retrieve (sensitive, confidential and public information) using
AES_ENCRYPT and AES_DECRYPT FUNCTIONS.
The password should be hashed using SHA.
Create database views
multi-factor authentication - authentication method in which credit card vault user is
granted access only after successfully presenting two or more pieces of evidence
Prepare a final project report.