How to decrypt SAMAccountName to text

Hi,

We created a Java web services for Create, Update and Retrieve the user in Active Directory. 

While CreateUser service, Active directory is storing the value in SAMAccountName in encrypted format if the value is greater than 20 characters.

During the RetrieveUser service, encrypted value is returned in SAMAccountName. Instead of this, we want to decrypt the value in SAMAccountName to simple text.

How can we do this? Please advice

Thank you.

Regards,

Vidya