On Sat, 15 Dec 2001, Gisle S{lensminde wrote:
> On Thu, 13 Dec 2001 AnandDinakar@xxxxxxx wrote:
>
> The fact that the keystream is plaintext independant is a problem. That
> means that the ciphertext (ie the disk) can be trivially broken if the
> same key is used for encrypting two or more blocks, or if the data is
> modified, and an attacker can read the data before and after the change.
This above unprecise. The problem with stream ciphers like SEAL that adds
a keystream to a sequence, is that they are trivially broken if two or
more plaintexts are encrypted with the same keystream. Basic cryptology
knowledge in other words.
--
Gisle Sælensminde ( gisle@xxxxxxxxx )
With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going
to land, and it could be dangerous sitting under them as they fly
overhead. (from RFC 1925)
-
Linux-crypto: cryptography in and on the Linux system
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