Re: A variation of CBC mode that yields authentication, integrity and privacy

From: Mok-Kong Shen (mok-kong.shen_at_t-online.de)
Date: 09/22/03 

Date: Mon, 22 Sep 2003 00:29:02 +0200

"David A. Scott" wrote:
>
[snip]
> I'm curious as to how you would add the padding using Moks method
> assume that you have a random data source for it. I will comment on the
> method that is if its something you really want to use and have analzyed.
[snip]

For any padding, one needs to know where the real
information ends. In past discussions on compression
with you, I rememeber that I suggested employing an ending
symbol, while John Savard suggested employing a length
field at the end for padding to byte or other boundaries.
(But one could certainly also have the length field
specified elsewhere in many situations.) In the present
context, ciphertext stealing avoids padding and such a
length field, but, in case one chooses to use padding,
a length field will be needed, if there isn't some
appropriate agreed-upon way to designate the end of
information.

M. K. Shen

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