You're using the email address as the encrytion key?
If that is so, then all you need for the password line is this:
Your password: #Decrypt (WebPassword, EmailAddress)#
If that is not so, then please show the code you use to Encrypt the the
If it is still not working, please show the results or error message that you
Also, are you specifying an algorithm or using the default?
What is the size of your database column for the password? It is possible
that the encrypted value is getting truncated.