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Jul
20
awarded  Tumbleweed
Jul
13
asked Estimation covariance of the Kalman filter state
Jul
13
answered Kalman filter for acceleremoter and gyro
May
16
awarded  Teacher
May
16
answered Interesting “real life” applications of serious theorems
Apr
20
comment An “additive” cryptographic hash-function that allows calculating the hash of some data from the hashes of the parts of that data.
What do you think about matrix multiplication or some form of concatenation+hash (cannot think a proper function right now)?
Apr
20
awarded  Editor
Apr
20
revised An “additive” cryptographic hash-function that allows calculating the hash of some data from the hashes of the parts of that data.
added 108 characters in body
Apr
20
comment An “additive” cryptographic hash-function that allows calculating the hash of some data from the hashes of the parts of that data.
Well, the $N^3$ (the size of the combination operator table) can be quite big for 1024-bit hashes. But I guess, some forms of rainbow tables could make brute-forcing faster. I wanted to use such hash for a version-control system to allow addressing parts of files.
Apr
20
comment An “additive” cryptographic hash-function that allows calculating the hash of some data from the hashes of the parts of that data.
Why would that allow it? Suppose $h(d) = md5(md5(d[0..n/2]),md5(d[n/2+1..n]))$ $hh(h1, h2) = md5(h1, h2)$. How would that compromise the security?
Apr
20
asked An “additive” cryptographic hash-function that allows calculating the hash of some data from the hashes of the parts of that data.
Feb
16
awarded  Student
Feb
15
asked Estimating the likelihood of independence of two discrete variables using the co-occurrence count matrix.
Dec
31
awarded  Supporter