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Decrypt text from a file

'Assembly: System.Security.dll

'Namespace: Microsoft.VisualBasic
'Namespace: System.Security.Cryptography
'Namespace: System.IO

'Dim privateKey AS Byte = "RijndaelAlg.Key"
'Dim initializationVector AS Byte = "RijndaelAlg.IV"

Dim fStream As FileStream = File.Open(filename, FileMode.OpenOrCreate)
Dim RijndaelAlg As Rijndael = Rijndael.Create
Dim cStream As New CryptoStream(fStream, _
    RijndaelAlg.CreateDecryptor(privatekey, initializationVector), _
    CryptoStreamMode.Read)

Dim sReader As New StreamReader(cStream)
Dim plainText As String = sReader.ReadLine()

sReader.Close()
cStream.Close()
fStream.Close()