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    SubjectRe: [PATCH] Delete cryptoloop
    On Mon, 2004-07-26 at 12:54, Jari Ruusu wrote:
    > Fruhwirth Clemens wrote:
    > > On Sun, 2004-07-25 at 19:25, Jari Ruusu wrote:
    > > > In short: exploit encodes watermark patterns as sequences of identical
    > > > ciphertexts.
    > >
    > > Probably I'm missing the point, but at the moment this looks like a
    > > chosen plain text attack. As you know for sure, this is trivial. For
    > > instance, AES asserts to be secure against this kind of attack. (See the
    > > author's definition of K-secure..).
    > > I'm suggesting it doesn't work at all.
    > Fruhwirth, your incompetence has always amazed me. And this time is no
    > exception. What is conserning is that some mainline folks seem to listening
    > to your ill opinions. No wonder that both mainline device crypto
    > implementations are such a joke.

    Please don't resort to personal defamations.

    To summarize for an innocent bystander:

    - The attacks you brought forward are in the best case a starting point
    for known plain text attacks. Even DES is secure against this attack,
    since an attacker would need 2^47 chosen plain texts to break the cipher
    via differential cryptanalysis. (Table 12.14 Applied Cryptography,
    Schneier). First, the watermark attack can only distinguish 32
    watermarks. Second, you'd need a ~2.000.000 GB to store 2^47 chosen
    plain texts. Third, I'm talking about DES (designed 1977!), no chance
    against AES.

    - The weaknesses brought forward by me are summarized at . Thanks goes to
    Pascal Brisset, who pointed out that cryptoloop is actually more secure
    than I assumed.

    If you, Jari, have any arguments left, it's time to state them now.
    Otherwise, have a nice day,
    Fruhwirth Clemens <>
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