Require 128-bit Encryption
Key pairs consist of two matching bit strings that indicate the keyÆs security level. You can strengthen security by increasing the encryption level from 40 bits (the default) to 128 bits. The more bits, the more difficult it is to decrypt the item. Users attempting to secure access must use the same encryption level that you set.

Due to export restrictions, the 128-bit key strength encryption feature is available only in the United States and Canada. For information about upgrading to 128-bit encryption capability, see http://www.microsoft.com/NTServerSupport.

To increase the encryption level from 40 bits to 128 bits, select the Require 128-bit Encryption check box. To return to 40-bit encryption, clear the Require 128-bit Encryption check box.