Cryptography/Network Security

Muhammad Adeel Malik

3.00/5 (24 votes)

Jun 1, 2006

CPOL

39370

1977

Cryptography Techniques(HASH,Asymmetric Cryptography,Symmetric Cryptography)

Introduction

This is class library which contains cryptography techniques

Asymmetric
Symmetric
Hash

These techniques also apply on files and text messages

Asymmetric Class

First we generate Keys

AsymmetricCryptography asy = new AsymmetricCryptography();

prk = asy.Private_Key;

pk = asy.Public_Key;

txtpk.Text=pk;

public keys
private keys
and then two static fucntion

Encrypt

AsymmetricCryptography asy = new AsymmetricCryptography();

asy.Private_Key = prk;

asy.Public_Key=pk;

txtcipher.Text = AsymmetricCryptography.Encript(txtplain.Text,asy.Public_Key);

And Decript

AsymmetricCryptography asy = new AsymmetricCryptography();

asy.Private_Key = prk;

asy.Public_Key=pk;

txtplain.Text = AsymmetricCryptography.Decript (txtcipher.Text,asy.Private_Key );

Symmetric Class

SymetricCryptography sym = new SymetricCryptography();

Initialization Vector

iv = sym.Initialization_Vector;

Session Key

sk = sym.Sessio_Key;

This is used to encrypt and decrypt files and texts

Encrypt

SymetricCryptography sym = new SymetricCryptography();

sym.Initialization_Vector = iv;

sym.Sessio_Key = sk;

txtcipher.Text= sym.EncryptString(txtplain.Text);

Decrypt

SymetricCryptography sym = new SymetricCryptography();

sym.Initialization_Vector = iv;

sym.Sessio_Key = sk;

txtcipher.Text= sym.EncryptString(txtplain.Text);

Hash Funtion

The hashcalulatore class uses the MD5 Hash function