DevForce Community Forum : Using an Encrypted EntitySet http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce Classic : Using an Encrypted EntitySet Fri, 12 Jun 2026 00:16:14 -700 Wed, 08 Aug 2007 15:53:24 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=363 DevForce Community Forum http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ Using an Encrypted EntitySet : A recent Tech Tip called "Saving... http://www.ideablade.com/forum/forum_posts.asp?TID=363&PID=896#896 Author: IdeaBlade
Subject: 363
Posted: 08-Aug-2007 at 3:53pm

A recent Tech Tip called "Saving and Restoring the Cache" briefly covered one method of encrypting the cache.  Here's another, better performing, way to save and restore an encrypted cache which takes advantage of stream chaining.  This simple example uses DES (remember to use the same key and initialization vector for both encryption and decryption):
 
 
using System.Security.Cryptography;
 
string fileName = Application.UserAppDataPath + "\\MyLocalData.bin";
DES des = DES.Create();
DESCryptoServiceProvider desCSP = new DESCryptoServiceProvider();
 
To save to an encrypted file:
 
Stream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.None);
CryptoStream cs = new CryptoStream(fs, desCSP.CreateEncryptor(des.Key, des.IV), CryptoStreamMode.Write);
 
mPersistenceManager.SaveEntitySet(cs, true);
 
And to restore an encrypted file:
 
Stream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
CryptoStream cs = new CryptoStream(fs, desCSP.CreateDecryptor(des.Key, des.IV), CryptoStreamMode.Read);
 
mPersistenceManager.RestoreEntitySet(cs, RestoreStrategy.Normal, true);

 

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