FYI: Special block cipher family DN and hash function family HDN
---------------------------------- Notes from the Hash Futures Panel, SECOND CRYPTOGRAPHIC HASH WORKSHOP, Santa Barbara, USA, August 24-25, 2006, http://www.proper.com/lookit/hash-futures-panel-notes.html (Paul Hoffman): "...At the end of this topic, Joux says that we do not understand what we are doing and that we do not really know what we want; there is agreement from all the panelists." ---------------------------------- I would like to announce: "Special block cipher family DN and new generation SNMAC-type hash function family HDN", IACR ePrint archive Report 2007/050, and source codes, including a benchmark, available on homepage http://cryptography.hyperlink.cz/SNMAC/SNMAC_EN.html. The paper also contains an explanation why we need the new cryptographic primitive for hash functions. In the paper introducing SNMAC (http://eprint.iacr.org/2006/376) I briefly explained why a classical block cipher is not an appropriate building block for compression function of a hash function. However, I think I didn't stress enough the need for a new cryptographic primitive to build hash functions. I think that the difference between a compression function and a classical block cipher is just the difference between "what we want" and "what we are doing". ---------------------------------- The differences are briefly: -------- classical block cipher X compression function: -------- it contains an element, unknown to the attacker X the attacker knows all inputs and is able to manipulate with them -------- its goal is to hide the plaintext structure and content in the ciphertext, this is based on a secret element, unknown to the attacker X its goal is to hide all structure and content of all inputs in the output, this is based on a public function -------- if the key is not variable, the function is a permutation X we need random transformation -------- invertible X one-way -------- it is easy to create collisions X we need the protection against it ------------------------- Hope that the new concept will be discussed. Best regards, Vlastimil Klima -- Nenechte se nachytat! Internet nemusí být drahý. Připojte se s VOLNÝ od 349 Kč. Více informací na http://adsl.volny.cz nebo na telefonu 800 880 842. --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]