Hi, I have the following encryption code:

    Dim encryptedKey As String = nothing


    <WebMethod()> Public Function Encrypt(ByVal password As String) As String


        Dim bEncryptedData() As Byte


        Dim rsaCSP As RSACryptoServiceProvider


        Dim bInput() As Byte


        Dim paramCSP As CspParameters


        paramCSP = New CspParameters()





        paramCSP.Flags = CspProviderFlags.UseMachineKeyStore


        rsaCSP = New RSACryptoServiceProvider(paramCSP)





        bInput = (New System.Text.UnicodeEncoding()).GetBytes(password)





        encryptionKey = rsaCSP.ToXmlString(True)





        bEncryptedData = rsaCSP.Encrypt(bInput, False)


        Encrypt = (New System.Text.UnicodeEncoding()).GetString(bEncryptedData).ToString()


    End Function

This works great, it generates a key and the pwd which I can then store in our DB, however, what I want to do now is use the existing key from the DB to encrypt another PWD to see if they match -- any idea how I can get the above code to use the encryptedKey string as teh encryption key??? ( I realise there are other password encryption methods but I have been playing with this one for too ling to give up now :) )

Cheers
Magnus

Instead of encrypting with keys I would suggest doing a one-way hash using MD5.Create("somepassword"). Store the hashed value in your database. When a user logs on, take the password they entered and has that password and compare it to the hashed value in the database.