2401bis Issue # 76 -- More explanation re: ESPv3 TFC padding &dummy packets

[Karen Seo <kseo@bbn.com>]

Folks,

Here's a description and proposed approach for:

IPsec Issue #:	76

Title:		More explanation re: ESPv3 TFC padding & dummy packets

Description:
============
Questions have been raised re: how much padding one should add and 
re: generation and discarding of dummy packets.  Should we add text 
explaining more about these topics?


Proposed approach:
==================
2401bis will be modified with text along the lines of:

"ESPv3 provides a facility to allow an arbitrary amount of padding to 
be appended to a packet, for traffic flow confidentiality, as well as 
a facility for efficient generation and discarding of "dummy" 
packets. Implementations SHOULD provide local management controls to 
enable the use of these capabilities on a per SA basis. The controls 
should specify which (if any) TFC features are to be employed, and 
provide parametric controls for the features.  For example, the 
controls might allow an administrator to generate random or fixed 
length dummy packets and to pad real packets to random or fixed 
lengths."

Thank you,
Karen