使用加密方式存储即可实现别人无法查看内容，加密的方式有很多，适用你这里使用的是可逆的算法，推荐你使用DES加密
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Imports System
Imports System.Collections.Generic
Imports System.Text
Imports System.IO
Imports System.Security
Imports System.Security.Cryptography
Namespace ZU14
NotInheritable Public Class DES
Private iv As String = "1234的yzo"
Private key As String = "123在yzo"
'/ summary
'/ DES加密偏移量，必须是=8位长的字符串
'/ /summary
Public Property IV() As String
Get
Return iv
End Get
Set
iv = value
End Set
End Property
'/ summary
'/ DES加密的私钥，必须是8位长的字符串
'/ /summary
Public Property Key() As String
Get
Return key
End Get
Set
key = value
End Set
End Property
'/ summary
'/ 对字符串进行DES加密
'/ /summary
'/ param name="sourceString"待加密的字符串/param
'/ returns加密后的BASE64编码的字符串/returns
Public Function Encrypt(sourceString As String) As String
Dim btKey As Byte() = Encoding.Default.GetBytes(key)
Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim ms As New MemoryStream()
Try
Dim inData As Byte() = Encoding.Default.GetBytes(sourceString)
Try
Dim cs As New CryptoStream(ms, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(inData, 0, inData.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Return Convert.ToBase64String(ms.ToArray())
Catch
End Try
Finally
ms.Dispose()
End Try
End Function 'Encrypt
'/ summary
'/ 对DES加密后的字符串进行解密
'/ /summary
'/ param name="encryptedString"待解密的字符串/param
'/ returns解密后的字符串/returns
Public Function Decrypt(encryptedString As String) As String
Dim btKey As Byte() = Encoding.Default.GetBytes(key)
Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim ms As New MemoryStream()
Try
Dim inData As Byte() = Convert.FromBase64String(encryptedString)
Try
Dim cs As New CryptoStream(ms, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(inData, 0, inData.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Return Encoding.Default.GetString(ms.ToArray())
Catch
End Try
Finally
ms.Dispose()
End Try
End Function 'Decrypt
'/ summary
'/ 对文件内容进行DES加密
'/ /summary
'/ param name="sourceFile"待加密的文件绝对路径/param
'/ param name="destFile"加密后的文件保存的绝对路径/param
Overloads Public Sub EncryptFile(sourceFile As String, destFile As String)
If Not File.Exists(sourceFile) Then
Throw New FileNotFoundException("指定的文件路径不存在！", sourceFile)
End If
Dim btKey As Byte() = Encoding.Default.GetBytes(key)
Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim btFile As Byte() = File.ReadAllBytes(sourceFile)
Dim fs As New FileStream(destFile, FileMode.Create, FileAccess.Write)
Try
Try
Dim cs As New CryptoStream(fs, des.CreateEncryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(btFile, 0, btFile.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Catch
Finally
fs.Close()
End Try
Finally
fs.Dispose()
End Try
End Sub 'EncryptFile
'/ summary
'/ 对文件内容进行DES加密，加密后覆盖掉原来的文件
'/ /summary
'/ param name="sourceFile"待加密的文件的绝对路径/param
Overloads Public Sub EncryptFile(sourceFile As String)
EncryptFile(sourceFile, sourceFile)
End Sub 'EncryptFile
'/ summary
'/ 对文件内容进行DES解密
'/ /summary
'/ param name="sourceFile"待解密的文件绝对路径/param
'/ param name="destFile"解密后的文件保存的绝对路径/param
Overloads Public Sub DecryptFile(sourceFile As String, destFile As String)
If Not File.Exists(sourceFile) Then
Throw New FileNotFoundException("指定的文件路径不存在！", sourceFile)
End If
Dim btKey As Byte() = Encoding.Default.GetBytes(key)
Dim btIV As Byte() = Encoding.Default.GetBytes(iv)
Dim des As New DESCryptoServiceProvider()
Dim btFile As Byte() = File.ReadAllBytes(sourceFile)
Dim fs As New FileStream(destFile, FileMode.Create, FileAccess.Write)
Try
Try
Dim cs As New CryptoStream(fs, des.CreateDecryptor(btKey, btIV), CryptoStreamMode.Write)
Try
cs.Write(btFile, 0, btFile.Length)
cs.FlushFinalBlock()
Finally
cs.Dispose()
End Try
Catch
Finally
fs.Close()
End Try
Finally
fs.Dispose()
End Try
End Sub 'DecryptFile
'/ summary
'/ 对文件内容进行DES解密，加密后覆盖掉原来的文件
'/ /summary
'/ param name="sourceFile"待解密的文件的绝对路径/param
Overloads Public Sub DecryptFile(sourceFile As String)
DecryptFile(sourceFile, sourceFile)
End Sub 'DecryptFile
End Class 'DES
End Namespace 'ZU14
对文本文件加密
Dim des As New ZU14.DES()
des.IV = "abcd哈哈笑"
des.Key = "必须八位"
'加密
des.EncryptFile("d:\a.txt", "d:\b.txt")
'解密
des.DecryptFile("d:\b.txt")
Private Function myEncrypt(ByVal Code As String) As String
Dim Result As String = ""
Dim CurrentChar As Char
For i As Integer = 0 To Code.Length - 1
CurrentChar = Code.Substring(i, 1)
Select Case Code.Substring(i, 1)
Case "Z"
Result = "a"
Case "z"
Result = "A"
Case Else
Result = Chr(Asc(CurrentChar) + 1)
End Select
Next
Return Result
End Function
'vb.net 2005 调试通过
我觉得你的并不是RSA加密解密算法。
在.net的有一个System.Security.Cryptography的命名空间，里面有一RSACryptoServiceProvider的类用来对byte进行RSA加密解密。
具体例子如下：
using System;
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter = new UnicodeEncoding();
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt = ByteConverter.GetBytes("Data to Encrypt");
byte[] encryptedData;
byte[] decryptedData;
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Pass the data to ENCRYPT, the public key information
//(using RSACryptoServiceProvider.ExportParameters(false),
//and a boolean flag specifying no OAEP padding.
encryptedData = RSAEncrypt(dataToEncrypt,RSA.ExportParameters(false), false);
//Pass the data to DECRYPT, the private key information
//(using RSACryptoServiceProvider.ExportParameters(true),
//and a boolean flag specifying no OAEP padding.
decryptedData = RSADecrypt(encryptedData,RSA.ExportParameters(true), false);
//Display the decrypted plaintext to the console.
Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
}
catch(ArgumentNullException)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine("Encryption failed.");
}
}
static public byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This only needs
//toinclude the public key information.
RSA.ImportParameters(RSAKeyInfo);
//Encrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo,bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This needs
//to include the private key information.
RSA.ImportParameters(RSAKeyInfo);
//Decrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
}
[Visual Basic]
Try
'Create a new RSACryptoServiceProvider object.
Dim RSA As New RSACryptoServiceProvider()
'Export the key information to an RSAParameters object.
'Pass false to export the public key information or pass
'true to export public and private key information.
Dim RSAParams As RSAParameters = RSA.ExportParameters(False)
Catch e As CryptographicException
'Catch this exception in case the encryption did
'not succeed.
Console.WriteLine(e.Message)
End Try
[C#]
try
{
//Create a new RSACryptoServiceProvider object.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Export the key information to an RSAParameters object.
//Pass false to export the public key information or pass
//true to export public and private key information.
RSAParameters RSAParams = RSA.ExportParameters(false);
}
catch(CryptographicException e)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine(e.Message);
}
