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# Questions tagged [hash]

Mathematical function that maps arbitrarily-sized data to fixed-size integers, often used as keys in hash tables or to help ensure data integrity

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### How do the following Hash Functions compare?

Consider the two hash functions used to map IP addresses. $x_i$ represents a octave (or "bit field") of the address. Hash Function 1: $$h_a(x_1, x_2, x_3, x_4) = \sum^{4}_{i=1} a_ix_i \bmod n$$ ...
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### Modulo hash function and multiples of three

This is a textbook based question. In The Art of Computer Programming Volume 3, Knuth says that for a hash function $h(k) = k \bmod M$, $M$ should not be a multiple of $3$. The explanation given is: ...
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### Collisions of prefixes of MD5 hashes in some fixed interval

I was wondering, if there is an MD5 hash collision in the UNSIGNED MEDIUMINT Range (0 - 16777215). Sadly, I'm unable to run a script to check this myself, due to Memory (RAM) limitations. The answer ...
112 views

### Algorithm that hashes a collection of sets following their disjointness relation

I wonder whether there is a simple algorithm to do this work: Say I have a collection of objects $C$, and a binary relation $R: C\times C$ that is auto-reflective ($\forall c\in C: c R c$) , and ...
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### A hash function with predicted collisions

As far as I know, the more collision-resistant a hash function is, the better. But is there any way to define a hash function with predicted collisions? In other words, a hash function that collides ...
709 views

### Weak hashing function for memorable IPv6 addresses

IPv6 addresses in the form of 862A:7373:3386:BF1F:8D77:D3D2:220F:D7E0 are much harder to memorize or even transcribe than the 4 octets of IPv4. There have been ...
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### Is open adressing with prime steps bijective?

Who can help me with this topic: Probing with a step width that is a prime number. I am struggling with this question about defining a hashing function $h(k, i)$ for open addressing on a table of ...
I am revising for a computer security course and I am stuck on one of the past questions. Here is it: Alice ($A$) wants to send a short message $M$ to Bob ($B$) using a shared secret $S_{ab}$ to ...