Cryptography/Network Security

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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