Order preserving cryptographic hash function

JelAppole

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п»їType(s) of Hashing function that keeps the ordering information.
I am asking this question from a perspective that we need to store a set of hashed data that can be queried later for in an ordered fashion. My situation is that some data has to be encrypted, I am thinking is there any function that I can store the ordering information relative to other data without getting the original value. So that I can sort the collection without original value but with another hashed value or any information that does not leak details on the original value. process expected: Saving A -> store encrypted(A) , store hash(A) Saving B -> store encrypted(B) , store hash(B) Saving C -> store encrypted(C) , store hash(C) . Sort List: if hash(A)
asked Aug 19, 2015 at 3:49.
101 2 2 bronze badges.
$\begingroup$ So you want hash(X) < hash(Y) iff X < Y, correct? $\endgroup$
Aug 19, 2015 at 4:11.
$\begingroup$ Yes. But has the property of hashing function that is not reversible. $\endgroup$
Aug 19, 2015 at 4:12.
$\begingroup$ If the hash function is order-preserving, and an attacker knows the hash function and hash(X), then they can recover the most significant part of X by binary search. Is that acceptable? $\endgroup$
Aug 19, 2015 at 5:11.
$\begingroup$ Sorry, I am not familiar with the term 'significant part'. Can you take an example like A as 11323 , what is the significant part? $\endgroup$
Aug 19, 2015 at 5:23.
$\begingroup$ The most significant part of some data is the part that most affects the sort order. For a five-digit number 11323, the first three digits 113__ are more significant than the last two digits ___23. The exact amount of data recoverable from a hash depends on the length of the hash. $\endgroup$


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