     case ReadEncrypt                                = 0x04
     case WriteEncrypt                               = 0x08
     
+    /* Not Used
     // Authentication
     public static let  Authentication               = [ReadAuthentication, WriteAuthentication]
     case ReadAuthentication                         = 0x10

    // Authorization
    case Authorized                                 = 0x40
    case None                                       = 0x80
}



/// ATT attribute permission bitfield values. Permissions are grouped as
/// "Access", "Encryption", "Authentication", and "Authorization". A bitmask of
/// permissions is a byte that encodes a combination of these.
public enum ATTAttributePermission: UInt8, BitMaskOption {
    
    // Access
    case Read                                       = 0x01
