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I starts with all relevant references I found, then tentatively answers the question. Feel free to improve this community wiki. It was originally asked the effort to break PKZIP 2 encryption, described in section 6.1 of the .ZIP File Format Specification (with some refinements in the derived Info-ZIP appnote), assuming a high-entropy password (that is, ...


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The problem can be simplified to the following problem, since the standard argument doesn't really take into account that you can't generate all the polynomials of the given maximum degree : Assume that we have sampled a random point $\vec{x}\in \mathbb{F}_p^n$. We let an adversary adaptively choose polynomials of degree at most $d$ and after each choice ...


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Lots of problems are hard to solve but easy to check. For example: finding hash pre-images of particular values such as 0 calculating discrete logs of small numbers modulo a prime finding the factors of a large composite of a special form like $2^p-1$ I don't think there's an essential difference between solving and checking they're just arbitrary ...


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What you are looking for is explicitly specified in the IEEE Standard 1363.1 [1], which covers NTRU. In particular, encoding a bit string into a polynomial is done in the following manner: Once you have processed the input message, you divide it into blocks of 3 bits, and transform each block in a pair of coefficients of a ternary polynomial according to a ...


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It's much easier to add a cost factor to the key derivation from the password than to add a lot of data to an encrypted container. See the PBKDF's PBKDF2, bcrypt and scrypt for more information, or see this Q/A for GPG. In general, an iteration to derive the key is of course much more efficient than adding overhead at the start of the file. If a key with an ...


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I'm not aware of any implementations, but I'm also not aware of any patents on this algorithm. Furthermore, that algorithm can quite directly be made tweakable, as that paper describes on pages 10-13.


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My implementation of Serpent is bit-sliced, so there is no initial permutation involved in generation of my round subkeys. It is also NESSIE byte ordered, which means that vectors will not match the AES submission package. I assume that IP will reorder the bits appropriately if you are using a non bit-sliced version. I just rewrote most of my implementation ...


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The notation you are seeing is for symmetric crypto. Garbled circuits typically use symmetric crypto since it can and symmetric crypto is fast. You may be able to do garbled circuits with asymmetric crypto, but it is definitely non-standard and may have subtle issues.



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