encryption..................

); Dicky.GetPublicKey (TING); system.environment.newline; console.writeline ("Dicky Ting's public key encryption information"); ezoneMessage TingMessage = Dicky.EncryptMessage ("i love you!") Console.Writeline (System.Environment.newline); Console.Writeline ("Dicky Gets Viisen's Public Key"); Dicky.GetPublicKey (Viisen); console.writeline (System.Environment.newline); console.writeline ("Dicky Use Viisen's public key encryption information "); ezoneMessage ViisenMessage = Dicky.EncryptMessage (" 2003 financial summary report is on your desk! "); Console.writeline (system.environment.newline; console.writeline "Ting uses your private key to decrypt information"); ting.decryptMessage (TingMessage); console.writeline (system.environment.newline); console.writeline ("Viisen's private key Decryption information"); Viisen.DecryptMessage ViiSenMessage; console.write Line (system.environment.newline);}} // mail object class ezoneMessage {public byte [] messagebody; // mail content (content via RC2 (symmetric encrypted) encrypted) public Byte [] rc2key; // rc2 Key (by RSA (asymmetric encrypted) encrypted) Public Byte [] RC2IV; // RC2 initialization vector} // Employee object class ezonePerson {// RSA (asymmetric encrypted object) Private RsacryptoServiceProvider ezonersa; // rc2 (Symmetry Confidential Object) Private RC2CryptoserviceProvider Ezonerc2; // Employee Name Private String Name; // Person Construction Method PUBLIC EZONEPERSON (String Name) {// Initialization Member Object this.ezonersa = New RsacryptoserviceProvider ();

THIS.EZONERC2 = New rc2cryptoserviceProvider (); this.name = name;} // Send public key public {// RSA's public key and key object Rsaparameters result = new rAparameters (); // Export EZONERSA The public key (FALSE means no private key) Result = this.ezonersa.exportParameters (false); Return Result;} // Get public key public void getpublicKey (ezonePerson Obj) {// Import the public key of the ezonePerson object. This.ezonersa. ImportParameters (Obj.SendPublicKey ());} // encrypted message public EzoneMessage EncryptMessage (string text) {EzoneMessage MessageObj = new EzoneMessage (); // converts from the message string into a byte array byte [] MessageBytes = System.Text.Encoding.utf8.getbytes (text); // Randomly created RC2 key this.ezonerc2.generateKey (); // randomly created RC2 initialization vector THIS.EZ Oneterc2.generateiv (); // encrypts RC2 key with RSA, and assigns a key to the RC2 of the message object (false means no filling, only Winxp or above * is supported) MessageObj.rc2key = this .Ezonersa.Encrypt (this.ezonerc2.key, false); // Give the vector value of the RC2 of the message MessageObj.rc2iv = this.ezonerc2.iv; // Create a encryption object ibryptotransform myencryptor = this.ezonerc2.createEncryptor () ; // a memory stream MemoryStream EzoneMemoryStream = new MemoryStream create (); // create an encrypted stream object CryptoStream MyEncryptoStream = new CryptoStream (EzoneMemoryStream, MyEncryptor, CryptoStreamMode.Write) on the basis of the memory stream;

// Write the mail content to the encrypted stream MYENCRYPTOSTREAM.WRIENCRYPTOSTREAM.WRITE (MessageBytes, 0, MessageBytes.Length); // Refresh the new Direct Buffer MYENCRYPTOSTREAM.FLUSHFINALBLOCK (); // Give MessageBody (Message Body) assignment ( after RC2 encrypted byte array) MessageObj.MessageBody = EzoneMemoryStream.ToArray (); EzoneMemoryStream.Close (); MyEncryptoStream.Close (); // returns EzoneMessage target return MessageObj;} // decrypt the message public void DecryptMessage (EzoneMessage obj ) {This.ezonerc2.iv = obj.rc2iV; try {// Decipse RC2 with RSA (FALSE indicates that there is no OAEP to fill, only WinXP or higher * is supported) this.ezonerc2.key = tris. Ezonersa.decrypt (Obj.rc2key, false);} catch (cryptographicException e) {console.writeline ("Decryption failed: E.Message); Return;} // Build a decryption target ICryptoTransform MyDecryptor = this.EzoneRC2.CreateDecryptor (); // create a memory stream, obj e-mail message to initialize memory stream MemoryStream EzoneMemoryStream = new MemoryStream (obj.MessageBody);! // memory stream on the basis of Create a decryption target CryptoStream MyDecryptoStream = new CryptoStream stream (EzoneMemoryStream, MyDecryptor, CryptoStreamMode.Read); // message content after storing the decrypted byte [] MessageText = new byte [obj.MessageBody.Length]; // decrypted data from the decrypted stream And write the decrypted data into the MessageText byte array of MyDecryptostream.Read (MessageText, 0, MessageText.length); ezoneMemoryStream.Close (); myDecryptostream.close ();

Console.writeline ("Decryption success:" system.text.Encoding.utf8.getstring (messagetext));}}} 2222222222222

(Yigang International -008) [Original] Use the DOTNET Password System to ensure data security

/// Author: Stardicky //// E-mail: Stardicky@hotmail.com //// qqnumber: 9531511 //// CompanyName: EZONE INTERNATIONAL / / / / / CLASS: HBS-0308 //// Title: Utilization DOTNET Password System Guaranteed Data Security / //// Note: DOTNET Cryptographic Disease Algorithm guarantees data security /// USING system; use system.io; use system.text; using system.security.cryptography; namespace EzoneInternationalSecurityCryptography {class EzoneSecurityCryptographyDemo {[STAThread] public static void Main (string [] args) {// the encrypted data (from the memory to a file) EzoneEncryptorDemo (); // decrypted data (from file to memory) EzoneDecryptorDemo ();} / //