On Tue, May 09, 2000 at 03:13:40PM -0400, Theodore Y. Ts'o wrote:
> ... and what prevents the attacker from simply updating the checksum
> when he's modifying the blocks?
As you may have not noticed, I am talking about a block device where
every data is enciphered. To be more specific, each 64 bit (or 128 bit)
block is enciphered with a different key. The attacker has not access to
the data, neither to the checksum. However, he knows where these items
are, and may perform modifications (although they would be essentially
random). Hence the checksum.
> Clearly you don't understand about cryptographic checksum.
Sarcasm ignored. I have been studying cryptography for the last 5 years.
--Thomas Pornin
