Messages in this thread | | | Date | Thu, 22 Jul 2004 21:44:15 +0200 | From | Pascal Brisset <> | Subject | Re: [PATCH] Delete cryptoloop |
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hpa@zytor.com (H. Peter Anvin) wrote in message news:<2kMAw-rl-15@gated-at.bofh.it>... > So does cryptoloop use a different IV for different blocks? The need > for the IV to be secret is different for different ciphers, but for > block ciphers the rule is that is must not repeat, and at least > according to some people must not be trivially predictable. [...]
The IV is predictable in cryptoloop and in other implementations. This causes specially crafted watermarks to be detectable through the encryption [1]. Pretty bad, but whether this is really a concern or not depends a lot on what you are encrypting.
-- Pascal
[1] Markku-Juhani Saarinen: Encrypted Watermarks; Security Vulnerabilities in Laptop Encryption (Security Forum Workshop 2004)
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